{"id":810,"date":"2017-01-27T00:15:46","date_gmt":"2017-01-27T00:15:46","guid":{"rendered":"https:\/\/brendans-island.com\/catholic-citizen\/?p=810"},"modified":"2024-09-07T23:31:45","modified_gmt":"2024-09-07T23:31:45","slug":"gems-metal-and-earths-core","status":"publish","type":"post","link":"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/","title":{"rendered":"Gems, Metal, and Earth&#8217;s Core"},"content":{"rendered":"<p><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#fire\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170124-_93767921_fireofoz-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>The Fire of Australia, a whacking great chunk of opal, isn&#8217;t particularly interesting from a &#8216;science&#8217; viewpoint.<\/p>\n<p>But I&#8217;m human, which is probably why anything big and shiny gets my attention: including that rock.<\/p>\n<p>Wrenching myself back on-topic, scientists found a stream of liquid metal flowing at the edge of Earth&#8217;s core. Studying it may help us learn why Earth&#8217;s magnetic field flip-flops at apparently-irregular intervals. What we&#8217;ll learn is beyond me: we didn&#8217;t know much about geomagnetic reversal when I started school.<\/p>\n<p>We still don&#8217;t, for that matter. As I keep saying, there is a very great deal left to learn.<\/p>\n<ol>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#fire\">The Fire of Australia Changes Hands<\/a>\n<ul>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#getting\">Getting a Grip About Opals and Luck<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#iron\">Iron &#8216;Jet Stream&#8217;<\/a>\n<ul>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#jet\">A &#8220;Jet of Liquid Iron,&#8221; Krakatoa, and Jet Streams<\/a><\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#moving\">Moving Metal and Questions<\/a><\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#magnetic\">Magnetic Field Reversals<\/a><\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#geomagnetic\">Geomagnetic Reversal, Magnetoreception: Still Learning<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#earth\">Earth&#8217;s Core: Halley, Pellucidar, and Reality<\/a>\n<ul>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#there\">There&#8217;s More to Learn<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#diamonds\">Diamonds From Liquid Metal<\/a><\/li>\n<\/ol>\n<hr \/>\n<h4><a name=\"once\"><\/a>&#8216;Once it Was Believed, Now We Know&#8217;<\/h4>\n<p><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/urban-evolution-and-big-brains\/#guess\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20130220ff\/20140903kupka-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>Back in my &#8216;good old days,&#8217; scientists were getting past the notion that Neanderthals were &#8220;cavemen,&#8221; and I&#8217;ve talked about that before. (<a href=\"https:\/\/brendans-island.com\/catholic-citizen\/urban-evolution-and-big-brains\/#guess\">January 13, 2017<\/a>; <a href=\"https:\/\/brendans-island.com\/catholic-citizen\/the-minden-monster-what-killed-lucy\/#5\">September 23, 2016<\/a>)<\/p>\n<p>I don&#8217;t know how often the &#8220;once it was believed, now we know&#8221; phrase popped up; but the science-related stuff I read often had a <a href=\"https:\/\/en.wiktionary.org\/wiki\/triumphalist\">triumphalist<\/a> tone. That was morphing into the currently-fashionable &#8216;and we&#8217;re all gonna die&#8217; attitude during my youth, which was well-established the last time I did time in academia.<\/p>\n<p>I think both assumptions make about as much sense as believing that using the brains God gave us offends the Almighty.<\/p>\n<p>Recapping what I&#8217;ve said before: acting like humans is okay.<\/p>\n<p>We&#8217;re <strong>supposed<\/strong> to be curious. A thirst for truth and happiness is written into each of us. If we&#8217;re doing our job right, the search will lead us to God. (Catechism of the Catholic Church, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p1s1c1.htm#27\">27<\/a>)<\/p>\n<p>Seeking the Almighty and studying this wonder-filled universe is part of being human. (Catechism, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p1s1c1.htm#35\">35<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p1s1c2a1.htm#50\">50<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p1s1c3a1.htm#159\">159<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c2a5.htm#2292\">2292<\/a>&#8211;<a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c2a5.htm#2296\">2296<\/a>)<\/p>\n<p>So is keeping this world in good working order. (<a href=\"http:\/\/www.vatican.va\/archive\/ENG0839\/_P3.HTM#PENT.GEN.1.26\">Genesis 1:26<\/a>&#8211;<a href=\"http:\/\/www.vatican.va\/archive\/ENG0839\/_P3.HTM#PENT.GEN.1.29\">29<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ENG0839\/_P4.HTM#PENT.GEN.2.15\">2:15<\/a>; Catechism, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p1s2c1p5.htm#339\">339<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p123a9p5.htm#952\">952<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c2a7.htm#2402\">2402<\/a>&#8211;<a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c2a7.htm#2405\">2405<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c2a7.htm#2456\">2456<\/a>)<\/p>\n<p>I talked about that last week. (<a href=\"https:\/\/brendans-island.com\/catholic-citizen\/climate-change-continues\/#stewardship\">January 20, 2017<\/a>)<\/p>\n<h4><a name=\"learning\"><\/a>Learning That There&#8217;s More to Learn<\/h4>\n<p><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/earth-overshoot-day-and-pollinators\/#ehrlich\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20160811-423px-Durer_Revelation_Four_Riders-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>Maybe I could endear myself to some folks by claiming that Earth has always been pretty much the way it is today: unchanged since the universe popped into existence at nightfall on 22 October <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ussher_chronology\">4004 BC<\/a>.<\/p>\n<p>That seems unreasonable. (<a href=\"https:\/\/brendans-island.com\/catholic-citizen\/humility-isnt-being-delusional\/#science\">July 31, 2016<\/a>)<\/p>\n<p>So does having hysterics over an impending environmental apocalypse. Some folks still apparently take Ehrlich&#8217;s prognostications seriously. I don&#8217;t. (<a href=\"https:\/\/brendans-island.com\/catholic-citizen\/earth-overshoot-day-and-pollinators\/#ehrlich\">August 12, 2016 <\/a>)<\/p>\n<p>I do think Earth&#8217;s climate is changing: and has been ever since our home formed, some <a href=\"https:\/\/en.wikipedia.org\/wiki\/Age_of_the_Earth\">4,540,000,000<\/a> years back; give or take 50,000,000. I&#8217;d be astonished if it <strong>stopped<\/strong> changing during my lifetime.<\/p>\n<p>I also think what we&#8217;ve been doing for the last <a href=\"https:\/\/en.wikipedia.org\/wiki\/History_of_agriculture\">11,500<\/a> years has had an increasingly noticeable effect, at least on a regional level.<\/p>\n<p>Developing industrial processes made a difference. I showed a global map of <a href=\"https:\/\/brendans-island.com\/catholic-citizen\/climate-change-continues\/#stewardship\">nitrogen dioxide<\/a> levels last week.<\/p>\n<p>But I don&#8217;t think this is a good time to try taking control of Earth&#8217;s climate. Not on a global level.<\/p>\n<p>In my considered opinion, we don&#8217;t know nearly enough to do that safely. Not yet. (<a href=\"https:\/\/brendans-island.com\/catholic-citizen\/climate-change-continues\/#learning\">January 20, 2017<\/a>)<\/p>\n<p>Good grief: a few centuries back, it looked like the universe might be no more than a few thousand years old. Nobody suspect that the Solar wind existed until <a href=\"https:\/\/en.wikipedia.org\/wiki\/Solar_wind#History\">1859<\/a>, and the jury&#8217;s still out on exactly how Solar activity affects Earth&#8217;s <a href=\"https:\/\/en.wikipedia.org\/wiki\/Solar_cycle#Climate\">climate<\/a><a>. <\/a><\/p>\n<p>We didn&#8217;t know for sure that Earth&#8217;s continents have been <a href=\"https:\/\/en.wikipedia.org\/wiki\/Plate_tectonics\">moving around<\/a> until I was an adult. That may have helped the current <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ice_age#Fluctuations_in_ocean_currents\">ice age<\/a> get started: but again, we&#8217;re not really sure. Not yet.<\/p>\n<p>It&#8217;s not that I think Earth never changes, or that we&#8217;re helpless to do anything about our home&#8217;s environment. But experimenting with <a href=\"https:\/\/en.wikipedia.org\/wiki\/Climate_engineering\">geoengineering<\/a> should probably wait until we know what we&#8217;re doing.<\/p>\n<hr \/>\n<h4><a name=\"fire\"><\/a><span style=\"font-size: x-large;\">1. <\/span>The Fire of Australia Changes Hands<\/h4>\n<p><a href=\"http:\/\/www.bbc.com\/news\/world-australia-38713957\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170124-_93767921_fireofoz-658.jpg?w=640&#038;ssl=1\" \/><\/a><br \/>\n<span style=\"font-size: xx-small;\">(From <a href=\"https:\/\/www.samuseum.sa.gov.au\/\">South Australian Museum<\/a>, via BBC News, used w\/o permission.)<\/span><br \/>\n(&#8220;The Fire of Australia is now on display in South Australia&#8221;<br \/>\n(BBC News))<\/p>\n<blockquote><p>&#8220;<a href=\"http:\/\/www.bbc.com\/news\/world-australia-38713957\">Fire of Australia: The return of the world&#8217;s finest uncut opal<\/a>&#8221;<br \/>\nBBC News (January 23, 2017)<\/p>\n<p>&#8220;<strong>The world&#8217;s finest uncut opal has mostly been kept in a safe deposit box since it was unearthed from the South Australian outback with a pick and shovel 70 years ago.<\/strong><\/p>\n<p>&#8220;Walter Bartram was prospecting in dusty terrain in Coober Pedy, about 750km (466 miles) north of Adelaide, in 1946 when he staked a claim to what became called the Fire of Australia.<\/p>\n<p>&#8220;Although his family achieved success in opal trading, their greatest discovery has been seen rarely by the public.<\/p>\n<p>&#8220;That has just changed.<\/p>\n<p>&#8220;The 998g (35.2oz) opal, valued at nearly A$900,000 (\u00a3550,000; $680,000), is now on display in Adelaide&#8217;s South Australian Museum&#8230;.&#8221;<\/p><\/blockquote>\n<p>Folks who care about such things call opal a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Mineraloid\">mineraloid<\/a>, not a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Mineral\">mineral<\/a>, since it&#8217;s an <a href=\"https:\/\/en.wikipedia.org\/wiki\/Amorphous_solid\">amorphous solid<\/a>, not crystalline. It&#8217;s a hydrated amorphous form of silica, with water content from 3 to 21% by weight \u2014 generally between 6 and 10%.<\/p>\n<p>Don&#8217;t bother trying to remember that. There will not be a test on this.<\/p>\n<p>Opals are good for looking at. My language&#8217;s word for the stone, &#8220;opal,&#8221; <a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Etymology\">comes from<\/a> Latin &#8220;opalus.&#8221; Romans got that word from <a href=\"https:\/\/en.wikipedia.org\/wiki\/Sanskrit\">Sanskrit<\/a> &#8220;\u00fapala,&#8221; probably.<\/p>\n<p>&#8220;Opalus&#8221; might have come from <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ops\">Ops<\/a>, the wife of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Saturn_(mythology)\">Saturn<\/a> and goddess of fertility. Part of the Roman <a href=\"https:\/\/en.wikipedia.org\/wiki\/Saturnalia\">Saturnalia<\/a> \u2014 think a major spring break <a href=\"https:\/\/www.merriam-webster.com\/dictionary\/blowout\">blowout<\/a> for adults \u2014 devoted to Ops was called &#8220;Opalia.&#8221; Again, you won&#8217;t be tested on this.<\/p>\n<p>Maybe &#8220;opalus&#8221; came from ancient Greek &#8220;opallios.&#8221; That word meant something like &#8220;seeing,&#8221; which is where we get &#8220;opaque&#8221;; it also meant &#8220;other&#8221; as in &#8220;alias&#8221; and &#8220;alter.&#8221; The ancient Greek origin isn&#8217;t likely, academics say; but a Sanskrit origin is.<\/p>\n<p>That sort of thing fascinates me. Your experience may vary.<\/p>\n<h4><a name=\"getting\"><\/a>Getting a Grip About Opals and Luck<\/h4>\n<p><a href=\"http:\/\/www.thejewelleryeditor.com\/jewellery\/article\/coober-pedy-centenary-australian-opals\/\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170124-Coober-Pedy_loose-opals_Fire-of-Australia-658.jpg?w=640&#038;ssl=1\" \/><\/a><br \/>\n<span style=\"font-size: xx-small;\">(From Photo by Ray Bartram\/the Bartram family, via <a href=\"http:\/\/www.thejewelleryeditor.com\/jewellery\/article\/coober-pedy-centenary-australian-opals\/\">The Jewellery Editor<\/a>, used w\/o permission.)<\/span><br \/>\n(&#8220;The Fire of Australia, discovered by the Bertram family in 1946, is the most valuable piece of rough light opal of its size in the world, weighing approximately 5,000 carats.&#8221;<br \/>\n(The Jewellery Editor))<\/p>\n<p>Folks have enjoyed looking at opal for millennia, particularly after giving the rocks a nice polish. Opals were considered lucky \u2014 good and bad, depending on which tradition you dip into.<\/p>\n<p>Sir Walter Scott&#8217;s &#8220;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Anne_of_Geierstein\">Anne of Geierstein<\/a>&#8221; featured a magic opal with <a href=\"https:\/\/en.wikipedia.org\/wiki\/Anne_of_Geierstein#Anne_of_Geierstein_and_opals\">lethal properties<\/a>. That tale apparently cut the sale of opals in the English-speaking world in half for something like two decades.<sup><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#1\">1<\/a><\/sup><\/p>\n<p>About opals, lucky\/unlucky stones, and such things \u2014 I have an agate, a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Geode\">geode<\/a>, a half-dozen <a href=\"https:\/\/en.wikipedia.org\/wiki\/The_California_Raisins#Merchandise\">California Raisins<\/a> from a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hardee%27s\">Hardee&#8217;s<\/a> promotion on my desk. They&#8217;re there because I think they look nice.<\/p>\n<p>If I thought they magically help me write, or guard my computer&#8217;s hard drive, or something like that, I&#8217;d have a problem.<\/p>\n<p>Superstition and magic are bad ideas. I don&#8217;t mean &#8216;take a rabbit out of my hat&#8217; <a href=\"https:\/\/en.wikipedia.org\/wiki\/Magic_(illusion)\">stage magic<\/a>. That&#8217;s about as &#8220;magical&#8221; as me making letters appear on a glowing screen, by twiddling my fingers over a keyboard.<\/p>\n<p>Now that I think of it, maybe that helps explain why some folks are scared of computers, and that&#8217;s another topic.<\/p>\n<p>Superstition feels a bit like religion. It can affect worship if someone gets the idea that prayer, for example, depends on &#8216;going through the motions.&#8217; It&#8217;s a bad idea. So is trying to tame occult powers or thinking &#8216;magic&#8217; charms make sense. (Catechism, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c1a1.htm#2110\">2110<\/a>&#8211;<a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c1a1.htm#2111\">2111<\/a>, <a href=\"http:\/\/www.vatican.va\/archive\/ccc_css\/archive\/catechism\/p3s2c1a1.htm#2117\">2117<\/a>)<\/p>\n<hr \/>\n<h4><a name=\"iron\"><\/a><span style=\"font-size: x-large;\">2. <\/span>Iron &#8216;Jet Stream&#8217;<\/h4>\n<p><a href=\"http:\/\/www.bbc.com\/news\/science-environment-38372342\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170124-_93036542_untitled-658.jpg?w=640&#038;ssl=1\" \/><\/a><br \/>\n<span style=\"font-size: xx-small;\">(From ESA, via BBC News, used w\/o permission.)<\/span><br \/>\n(&#8220;Artwork: A depiction of where the jet is moving &#8211; in the outer core. The Swarm satellites fly a few hundred km above the planet and sense its magnetic field&#8221;<br \/>\n(BBC News))<\/p>\n<blockquote><p>&#8220;<a href=\"http:\/\/www.bbc.com\/news\/science-environment-38372342\">Iron &#8216;jet stream&#8217; detected in Earth&#8217;s outer core<\/a>&#8221;<br \/>\nJonathan Amos, BBC News (December 19, 2016)<\/p>\n<p>&#8220;<strong>Scientists say they have identified a remarkable new feature in Earth&#8217;s molten outer core.<\/strong><\/p>\n<p>&#8220;They describe it as a kind of &#8216;jet stream&#8217; &#8211; a fast-flowing river of liquid iron that is surging westwards under Alaska and Siberia.<\/p>\n<p>The moving mass of metal has been inferred from measurements made by <a href=\"http:\/\/www.esa.int\/Our_Activities\/Observing_the_Earth\/Swarm\">Europe&#8217;s Swarm satellites<\/a>.<\/p>\n<p>&#8220;This trio of spacecraft are currently mapping Earth&#8217;s magnetic field to try to understand its fundamental workings&#8230;.&#8221;<\/p><\/blockquote>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/North_Magnetic_Pole\">Magnetic north<\/a>, the point on Earth&#8217;s surface where the planet&#8217;s magnetic field lines are vertical, was near the rotational pole when <a href=\"https:\/\/en.wikipedia.org\/wiki\/Thales_of_Miletus\">Thales of Miletus<\/a> noticed that lodestones attract iron.<\/p>\n<p>Folks started using lodestones for <a href=\"https:\/\/en.wikipedia.org\/wiki\/History_of_the_compass\">navigation<\/a> during the Song Dynasty, about a thousand years back. Being able to navigate between ports is important, so folks have been keeping track of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Magnetic_declination\">magnetic declination<\/a> ever since.<\/p>\n<p>We learned that the magnetic pole moves around. It&#8217;s been drifting west since about 1400. It had been drifting eastward for about four centuries before that. We call the drift &#8220;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Secular_variation\">secular variation<\/a>, which brings me back to the satellites and those scientists.<\/p>\n<h4><a name=\"jet\"><\/a>A &#8220;Jet of Liquid Iron,&#8221; Krakatoa, and Jet Streams<\/h4>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Jet_stream#Description\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170126-Jetstreamconfig-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>&#8220;Fast-flowing&#8221; is a relative term.<\/p>\n<blockquote><p>&#8220;&#8230;&#8217;This jet of liquid iron is moving at about fifty kilometres per year,&#8217; explained Dr Chris Finlay from the National Space Institute at the Technical University of Denmark (DTU Space).<\/p>\n<p>&#8220;&#8216;That might not sound like a lot to you on Earth&#8217;s surface, but you have to remember this a very dense liquid metal and it takes a huge amount of energy to move this thing around&#8230;&#8217;&#8230;.&#8221;<br \/>\n(<a href=\"http:\/\/www.bbc.com\/news\/science-environment-38372342\">Jonathan Amos<\/a>, BBC News)<\/p><\/blockquote>\n<p>About <a href=\"https:\/\/en.wikipedia.org\/wiki\/Jet_stream\">jet streams<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Wiley_Post\">Wiley Post<\/a> often gets credit for discovering Earth&#8217;s jet streams, since he noticed his ground speed was higher than the air speed in certain places. The story is a bit more complicated, though.<\/p>\n<p>Folks noticed an &#8220;equatorial smoke stream&#8221; after the 1883 <a href=\"https:\/\/en.wikipedia.org\/wiki\/1883_eruption_of_Krakatoa\">Krakatoa eruption<\/a>.<\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Wasaburo_Oishi\">Wasaburo Oishi&#8217;s<\/a> reports from 1926 to 1944 are recognized as evidence of jet streams today. Wasaburo tried making his research available to folks living outside Japan by publishing in <a href=\"https:\/\/en.wikipedia.org\/wiki\/Esperanto\">Esperanto<\/a>.<\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Heinrich_Seilkopf\">Heinrich Seilkopf<\/a> called the phenomena Strahlstr\u00f6mung, or &#8220;jet flow,&#8221; in <a href=\"https:\/\/en.wikipedia.org\/wiki\/Jet_stream#Discovery\">1939<\/a>.<\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/L._L._Zamenhof\">L. L. Zamenhof<\/a> put Esperanto together in the 1870s and 1880s. Having a common <a href=\"https:\/\/en.wikipedia.org\/wiki\/World_language\">world language<\/a> is, I think, a good idea. Mandarin would be a pretty good choice <a href=\"https:\/\/en.wikipedia.org\/wiki\/World_language#Living_world_languages\">these days<\/a>, except just about everyone who understands it lives in China.<\/p>\n<p>Inventing one and then trying to get folks who aren&#8217;t language geeks to go along with the idea \u2014 didn&#8217;t work out so well. And that&#8217;s yet another topic.<\/p>\n<p>Where was I? Thales of Miletus, lodestones, jet streams, Esperanto. Right.<\/p>\n<h4><a name=\"moving\"><\/a>Moving Metal and Questions<\/h4>\n<p><a href=\"http:\/\/nature.com\/articles\/doi:10.1038\/ngeo2859\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170125-Figure2-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>These scientists figure that the moving metal stream is about 420 kilometers, 261 miles, wide; and wraps halfway around the planet. How deep it is \u2014 is a good question.<\/p>\n<p>They figure it&#8217;s the boundary between two parts of Earth&#8217;s core. If they&#8217;re right, liquid iron approaching the boundary from both sides gets squeezed out sideways; forming the jet, which moves along the tube-shaped boundary.<\/p>\n<p>They don&#8217;t have enough data to be sure, but their math suggests that the tube could extend all the way through to the core&#8217;s other side, in Earth&#8217;s southern hemisphere.<\/p>\n<p>Learning more about this &#8216;jet stream&#8217; and the rest of Earth&#8217;s core should help us understand how Earth&#8217;s magnetic field works.<sup><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#2\">2<\/a><\/sup> That, I think, could be very important.<\/p>\n<p>Now, a scary headline from days gone by.<\/p>\n<h4><a name=\"magnetic\"><\/a>Magnetic Field Reversals<\/h4>\n<p><a href=\"http:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20130220ff\/20141022-NASA_54559main_comparison1_strip-658.jpg?w=640&#038;ssl=1\" \/><\/a><br \/>\n<span style=\"font-size: xx-small;\">(From NASA, via Wikimedia Commons, used w\/o permission.)<\/span><br \/>\n(&#8220;NASA computer simulation &#8230; The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and vertical. The dense clusters of lines are within the Earth&#8217;s core.&#8221;<br \/>\n(Wikipedia))<\/p>\n<blockquote><p>&#8220;<a href=\"http:\/\/metro.co.uk\/2014\/10\/21\/earths-magnetic-field-is-about-to-flip-scientists-warn-4914467\/\">Earth&#8217;s magnetic field &#8216;could flip in the space of 100 years&#8217;, scientists warn<\/a>&#8221;<br \/>\nRob Waugh, Metro.co.uk (October 21, 2014)<\/p>\n<p>&#8220;<strong>Earth&#8217;s magnetic field can flip far faster than previously thought \u2013 unleashing a force which Mayan apocalypse believers thought might destroy our planet in 2012.<\/strong>&#8230;&#8221;<\/p><\/blockquote>\n<p>Breathless &#8216;and-we&#8217;re-all-gonna-die&#8217; journalistic enthusiasm aside, I probably won&#8217;t live to see Earth&#8217;s magnetic field flip over: but you might.<\/p>\n<p>The science behind that Metro.co.uk piece is solid enough, but nowhere near as dramatic:<\/p>\n<ul>\n<li>&#8220;<a href=\"https:\/\/academic.oup.com\/gji\/article\/199\/2\/1110\/618671\/Extremely-rapid-directional-change-during-Matuyama\">Extremely rapid directional change during Matuyama-Brunhes geomagnetic polarity reversal<\/a>&#8221;<br \/>\nLeonardo Sagnotti, Giancarlo Scardia, Biagio Giaccio, Joseph C. Liddicoat, Sebastien Nomade, Paul R. Renne, Courtney J. Sprain; Geophysical Journal International (September 18, 2014)<\/li>\n<li>&#8220;<a href=\"http:\/\/igpphome.ucsd.edu\/~cathy\/Publications\/Preprints\/geomag_reversals_preprint.pdf\">Geomagnetic Reversals: Rates, Timescales, Preferred Paths, Statistical Models and Simulations<\/a>&#8221;<br \/>\nCatherine Constable; Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography (September 30, 2001)<\/li>\n<\/ul>\n<p>It&#8217;s been about a century since scientists like <a href=\"https:\/\/en.wikipedia.org\/wiki\/Motonori_Matuyama\">Motonori Matuyama<\/a> started finding evidence that &#8220;magnetic north&#8221; wasn&#8217;t always near the north pole. Other scientists didn&#8217;t get the memo, or weren&#8217;t interested.<\/p>\n<p>Then folks mapping Earth&#8217;s seafloors in the 1950s and 1960s noticed <a href=\"https:\/\/en.wikipedia.org\/wiki\/Paleomagnetism\">alternating magnetic stripes<\/a> running parallel to Earth&#8217;s <a href=\"https:\/\/en.wikipedia.org\/wiki\/Mid-ocean_ridge\">mid-ocean ridges<\/a>.<\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Lawrence_Morley\">Lawrence Morley<\/a> eventually <a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#History\">got credit<\/a> for his explanation of seafloor spreading, but editors working for Nature and Journal of Geophysical Research hadn&#8217;t felt like publishing it at the time.<\/p>\n<h4><a name=\"geomagnetic\"><\/a>Geomagnetic Reversal, Magnetoreception: Still Learning<\/h4>\n<p><a href=\"http:\/\/en.wikipedia.org\/wiki\/Magnetic_anomaly#Ocean_floor_stripes\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20130220ff\/20141022-Magnetic_anomalies_off_west_coast_of_North_America-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>The magnetic stripes form when particles in iron-rich rock welling up at mid-ocean ridges &#8216;freezes&#8217; in line with Earth&#8217;s magnetic field.<\/p>\n<p>This gives scientists a pretty good record of field reversals for the last 180,000,000 years. That&#8217;s the age of Earth&#8217;s oldest existing seafloor. The rest has long since been recycled back into the interior.<\/p>\n<p>I&#8217;ve read that Earth&#8217;s magnetic field reversals happen at &#8220;random&#8221; intervals. My guess is that there&#8217;s a pattern to Earth&#8217;s magnetic field reversals, but scientists haven&#8217;t found it yet.<\/p>\n<p>How much time passes between reversals has changed: a lot.<\/p>\n<p>Field reversals started coming closer together a bit upwards of 80,000,000 years back, after a long comparatively-stable patch. There was another fast-changing period about 120,000,000 to 160,000,000 years ago.<\/p>\n<p>A few times 10,000,000 years have gone by with no reversals. Earth&#8217;s field flip-flopped five times in a million years about 72,000,000 years back, and the <a href=\"https:\/\/en.wikipedia.rg\/wiki\/Laschamp_event\">Laschamp event<\/a>, some 41,400 years back \u2014 give or take 2,000 \u2010 only lasted a few centuries.<\/p>\n<p>Something causes those reversals, and scientists have come up with a few explanations: but none that match available data.<sup><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#3\">3<\/a><\/sup><\/p>\n<p>The idea that mass extinctions happened during field reversals looked good: except there isn&#8217;t a particularly good correlation between the two phenomena.<\/p>\n<p>The reversals probably affect <a href=\"https:\/\/en.wikipedia.org\/wiki\/Magnetoreception\">critters<\/a> that use magnetic fields for navigation, like homing pigeons. How magnetoreception works another mystery.<sup><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#4\">4<\/a><\/sup><\/p>\n<p>On the other hand, considering that we didn&#8217;t know about that sense just a few decades back: we&#8217;re not doing too badly.<\/p>\n<hr \/>\n<h4><a name=\"earth\"><\/a><span style=\"font-size: x-large;\">3. <\/span>Earth&#8217;s Core: Halley, Pellucidar, and Reality<\/h4>\n<p><a href=\"http:\/\/www.bbc.com\/news\/science-environment-38561076\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170124-_93331038_c0034193-earth_layers_artwork-spl-658.jpg?w=640&#038;ssl=1\" \/><\/a><br \/>\n<span style=\"font-size: xx-small;\">(From Science Photo Library, via BBC News, used w\/o permission.)<\/span><br \/>\n(&#8220;This study suggests silicon exists in the Earth&#8217;s inner core with iron and nickel&#8221;<br \/>\n(BBC News))<\/p>\n<blockquote><p>&#8220;<a href=\"http:\/\/www.bbc.com\/news\/science-environment-38561076\">New candidate for &#8216;missing element&#8217; in Earth&#8217;s core<\/a>&#8221;<br \/>\nRebecca Morelle, BBC News (January 10, 2017)<\/p>\n<p>&#8220;<strong>Japanese scientists believe they have established the identity of a &#8216;missing element&#8217; within the Earth&#8217;s core.<\/strong><\/p>\n<p>&#8220;They have been searching for the element for decades, believing it makes up a significant proportion of our planet&#8217;s centre, after iron and nickel.<\/p>\n<p>&#8220;Now by recreating the high temperatures and pressures found in the deep interior, experiments suggest the most likely candidate is silicon.<\/p>\n<p>&#8220;The discovery could help us to better understand how our world formed&#8230;.&#8221;<\/p><\/blockquote>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Historical_development_of_alternative_conceptions\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170125-400px-Hollow_Earth-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>We&#8217;ve learned quite a bit since <a href=\"https:\/\/en.wikipedia.org\/wiki\/Edmond_Halley\">Edmond Halley<\/a> read <a href=\"https:\/\/en.wikipedia.org\/wiki\/Isaac_Newton\">Sir Isaac Newton&#8217;s<\/a> 1687 <a href=\"https:\/\/en.wikipedia.org\/wiki\/Philosophi%C3%A6_Naturalis_Principia_Mathematica\">Philosophi\u00e6 Naturalis Principia Mathematica<\/a>.<\/p>\n<p>One of those two got the numbers wrong for Earth and our moon&#8217;s density.<\/p>\n<p>Assuming that Earth is much less dense than our moon \u2014 it&#8217;s not \u2014 Halley said Earth could be hollow shell about 500 miles thick, with two more shells inside.<\/p>\n<p>He used the diameters of Venus, Mars, and Mercury to define the inner shells, which makes a nifty picture. There&#8217;s a sort of elegance to the notion of nested shells inside Earth, whose diameters match other Solar planets.<\/p>\n<p>But it&#8217;s not how reality works.<\/p>\n<p>Maybe because a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hollow_Earth\">hollow Earth<\/a> figures in folklore and mythologies, the idea hasn&#8217;t gone away.<\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Ludvig_Holberg\">Ludvig Holberg&#8217;s<\/a> 1741 novel, &#8220;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Niels_Klim%27s_Underground_Travels\">Nicolai Klimii iter subterraneum<\/a>\/Niels Klim&#8217;s Underground Travels,&#8221; has been followed by <a href=\"https:\/\/en.wikipedia.org\/wiki\/Edgar_Rice_Burroughs\">Burroughs&#8217;s<\/a> <a href=\"https:\/\/en.wikipedia.org\/wiki\/Pellucidar\">Pellucidar<\/a> tales, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Gears_of_War\">Gears of War<\/a>, and folks who think Earth really is hollow.<\/p>\n<h4><a name=\"there\"><\/a>There&#8217;s More to Learn<\/h4>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170125-500px-Earthquake_wave_paths-329.jpg?w=640&#038;ssl=1\" align=\"right\" \/><\/a>At the moment, the world&#8217;s <a href=\"https:\/\/en.wikipedia.org\/wiki\/List_of_deepest_mines\">deepest mine<\/a> is four kilometers deep. The deepest borehole is still the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Kola_Superdeep_Borehole\">Kola Superdeep Borehole<\/a>, reaching 12.262 kilometers below Earth&#8217;s surface in 1989. That&#8217;s part-way through Earth&#8217;s crust.<\/p>\n<p>Folks are still trying to get samples of material from the next layer under Earth&#8217;s crust, the mantle:<\/p>\n<ul>\n<li>&#8220;<a href=\"http:\/\/www.smithsonianmag.com\/science-nature\/decades-long-quest-drill-earths-mantle-may-soon-hit-pay-dirt-180957908\/\">A Decades-Long Quest to Drill Into Earth&#8217;s Mantle May Soon Hit Pay Dirt<\/a>&#8221;<br \/>\nSid Perkins, Smithsonian.com (January 25, 2016)<\/li>\n<\/ul>\n<p>Given humanity&#8217;s seemingly-insatiable curiosity, my guess is that we&#8217;ll succeed before this century is over.<\/p>\n<p>Meanwhile, studying <a href=\"https:\/\/en.wikipedia.org\/wiki\/Seismic_wave\">seismic waves<\/a>, stuff brought up by volcanoes, and Earth&#8217;s gravitational and magnetic fields, help scientists figure out what&#8217;s inside.<\/p>\n<p>Technology like <a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_anvil_cell\">diamond anvil cells<\/a> and laser-driven <a href=\"https:\/\/en.wikipedia.org\/wiki\/Shock_tube#Applications\">shock tubes<\/a> developed over the last century lets scientists approximate extreme pressures and temperatures in Earth&#8217;s inner regions. Some <a href=\"https:\/\/en.wikipedia.org\/wiki\/Inertial_confinement_fusion\">inertial confinement fusion<\/a> devices use similar laser tech, and controlled <a href=\"https:\/\/en.wikipedia.org\/wiki\/Nuclear_fusion#Process\">nuclear fusion<\/a> is yet again another topic.<\/p>\n<p>The last I heard, opinion is divided on whether Earth&#8217;s inner <a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Core\">core<\/a> is solid, or <a href=\"https:\/\/en.wikipedia.org\/wiki\/Plasma_(physics)\">plasma<\/a> that&#8217;s dense as a solid. It&#8217;s possible \u2014 this is even less certain and more debatable \u2014 that our planet&#8217;s core is a single huge iron crystal.<sup><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#5\">5<\/a><\/sup><\/p>\n<p>This is not the world I grew up in. It&#8217;s a great deal more interesting. For the most part I like living in &#8216;the future,&#8217; and that&#8217;s still another topic.<\/p>\n<hr \/>\n<h4><a name=\"diamonds\"><\/a><span style=\"font-size: x-large;\">4. <\/span>Diamonds From Liquid Metal<\/h4>\n<p><a href=\"http:\/\/www.sciencemag.org\/news\/2016\/12\/earth-s-rarest-diamonds-formed-pockets-liquid-metal\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/brendans-island.com\/blogsource\/20160719ff\/20170124-cc_71V8124-Edit_16x9-658.jpg?w=640&#038;ssl=1\" \/><\/a><br \/>\n<span style=\"font-size: xx-small;\">(From <a href=\"http:\/\/www.nemesisinternational.com\/\">Nemesis International<\/a> DMCC\/Donald Woodrow photographer, via Science, used w\/o permission.)<\/span><br \/>\n(&#8220;Tiny blobs of material trapped inside large, clear diamonds (such as this one) as they formed suggest the gems formed within pockets of liquid metal deep within Earth.&#8221;<br \/>\n(Science))<\/p>\n<blockquote><p>&#8220;<a href=\"http:\/\/www.sciencemag.org\/news\/2016\/12\/earth-s-rarest-diamonds-formed-pockets-liquid-metal\">Earth&#8217;s rarest diamonds formed in pockets of liquid metal<\/a>&#8221;<br \/>\nSid Perkins Science (Decenber 15, 2016)<\/p>\n<p>&#8220;Some of the most prized diamonds on Earth are unusually clear, exceedingly rare, and often extraordinarily large. Researchers have long wondered how such gems formed, but they&#8217;ve been hard to study because they&#8217;ve typically ended up on ring fingers rather than under a microscope. Now, a new analysis of imperfections trapped within the diamonds provides the first direct evidence that they were forged within blobs of liquid metal hundreds of kilometers below Earth&#8217;s surface&#8230;.&#8221;<\/p><\/blockquote>\n<p>Hundreds of kilometers down is still a long way from Earth&#8217;s core, but it&#8217;s closer than hat borehole: and these are actual samples from Earth&#8217;s interior, not laboratory approximations.<sup><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#6\">6<\/a><\/sup><\/p>\n<p>This research helps scientists learn Earth&#8217;s internal chemistry.<\/p>\n<p>It&#8217;s also, I think, interesting because diamonds are comparatively rare and sparkly; and have inspired a lot of colorful tales.<sup><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/#7\">7<\/a><\/sup><\/p>\n<p>More, mostly about using our brains:<\/p>\n<ul>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/climate-change-continues\/\">Climate Change Continues<\/a>&#8221;<br \/>\n(January 20, 2017)<\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/tides-and-our-moons-origin\/\">Tides and Our Moon&#8217;s Origin<\/a>&#8221;<br \/>\n(December 9, 2016)<\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/near-earth-asteroids\/\">Near-Earth Asteroids<\/a>&#8221;<br \/>\n(November 4, 2016)<\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/the-minden-monster-what-killed-lucy\/\">The Minden Monster, What Killed Lucy<\/a>&#8221;<br \/>\n(September 23, 2016)<\/li>\n<li><a href=\"https:\/\/brendans-island.com\/catholic-citizen\/faith-the-universe-and-wisdom\/\">Faith, the Universe, and Wisdom<\/a>&#8221;<br \/>\n(August 28, 2016)<\/li>\n<\/ul>\n<hr \/>\n<p><sup><a name=\"1\"><\/a>1<\/sup> Opals and a partly-underground town:<\/p>\n<ul>\n<li>Wikipedia\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Coober_Pedy\">Coober Pedy<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal\">Opal<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Precious_opal\">Precious opal<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Common_opal\">Common opal<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Other_varieties_of_opal\">Other varieties of opal<\/a>\n<ul>\n<li>Fire opal<\/li>\n<li>Girasol opal<\/li>\n<li>Peruvian opal<\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Sources\">Sources<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Synthetic_opal\">Synthetic opal<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Historical_superstitions\">Historical superstitions<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Opal#Famous_opals\">Famous opals<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>&#8220;<a href=\"http:\/\/www.thejewelleryeditor.com\/jewellery\/article\/coober-pedy-centenary-australian-opals\/\">Coober Pedy opals: Australian opal capital of the world celebrates a century of mining<\/a>&#8221;<br \/>\nMelissa Pearce, The Jewellery Editor (March 30, 2015)<\/li>\n<li><a href=\"https:\/\/www.samuseum.sa.gov.au\/\">South Australian Museum<\/a><\/li>\n<\/ul>\n<p><sup><a name=\"2\"><\/a>2<\/sup> Earth&#8217;s newly-discovered iron &#8216;jet stream:&#8217;<\/p>\n<ul>\n<li>&#8220;<a href=\"http:\/\/nature.com\/articles\/doi:10.1038\/ngeo2859\">An accelerating high-latitude jet in Earth&#8217;s core<\/a>&#8221;<br \/>\nPhilip W. Livermore, Rainer Hollerbach, Christopher C. Finlay; Nature Geoscience (January 2017)<\/li>\n<li>ESA (European Space Agency)\n<ul>\n<li><a href=\"http:\/\/www.esa.int\/Our_Activities\/Observing_the_Earth\/Swarm\">Swarm<\/a><br \/>\nObserving the Earth<\/p>\n<ul>\n<li>&#8220;<a href=\"http:\/\/www.esa.int\/Our_Activities\/Observing_the_Earth\/Swarm\/There_s_a_jet_stream_in_our_core\">There&#8217;s a Jet Stream in Our Core<\/a>&#8221;<br \/>\n(December 19, 2016)<\/li>\n<li>&#8220;<a href=\"http:\/\/www.esa.int\/Our_Activities\/Observing_the_Earth\/Swarm\/Swarm_reveals_why_satellites_lose_track\">Swarm Reveals Why Satellites Lose Track<\/a>&#8221;<br \/>\n(October 28, 2016)<\/li>\n<li>&#8220;<a href=\"http:\/\/www.esa.int\/Our_Activities\/Observing_the_Earth\/Swarm\/Magnetic_oceans_and_electric_Earth\">Magentic Oceans and Electric Earth<\/a>&#8221;<br \/>\n(October 3, 2016)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Wikipedia\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Compass\">Compass<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field\">Earth&#8217;s magnetic field<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Importance\">Importance<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Main_characteristics\">Main characteristics<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Magnetosphere\">Magnetosphere<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Time_dependence\">Time dependence<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Short-term_variations\">Short-term variations<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Secular_variation\">Secular variation<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Magnetic_field_reversals\">Magnetic field reversals<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Earliest_appearance\">Earliest appearance<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Future\">Future<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Physical_origin\">Physical origin<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Measurement_and_analysis\">Measurement and analysis<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Earth's_magnetic_field#Biomagnetism\">Biomagnetism<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/History_of_the_compass\">History of the compass<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Lodestone\">Lodestone<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Lodestone#Origin\">Origin<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Lodestone#History\">History<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><sup><a name=\"3\"><\/a>3<\/sup> Earth&#8217;s changing magnetic field:<\/p>\n<ul>\n<li>Wikipedia\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal\">Geomagnetic reversal<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#History\">History<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#Observing_past_fields\">Observing past fields<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#Geomagnetic_polarity_time_scale\">Geomagnetic polarity time scale<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#Character_of_transitions\">Character of transitions<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#Causes\">Causes<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#Hypothesized_triggers\">Hypothesized triggers<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#Effects_on_biosphere\">Effects on biosphere<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Paleomagnetism\">Paleomagnetism<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><sup><a name=\"4\"><\/a>4<\/sup> Earth&#8217;s magnetic field and critters:<\/p>\n<ul>\n<li>Wikipedia\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Dipole_model_of_the_Earth's_magnetic_field\">Dipole model of the Earth&#8217;s magnetic field<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Dynamo_theory\">Dynamo theory<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Dynamo_theory#History_of_theory\">History of theory<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Dynamo_theory#Formal_definition\">Formal definition<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Dynamo_theory#Kinematic_dynamo_theory\">Kinematic dynamo theory<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Dynamo_theory#Nonlinear_dynamo_theory\">Nonlinear dynamo theory<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Dynamo_theory#Numerical_models\">Numerical models<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal\">Geomagnetic reversal<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Geomagnetic_reversal#Effects_on_biosphere\">Effects on biosphere<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Magnetoreception\">Magnetoreception<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><sup><a name=\"5\"><\/a>5<\/sup> Some of what we know, and what we don&#8217;t:<\/p>\n<ul>\n<li>Wikipedia\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Crust_(geology)\">Crust (geology)<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Crust_(geology)#Earth.27s_crust\">Earth&#8217;s crust<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Mantle_(geology)\">Mantle (geology)<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Inner_core\">Inner core<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Outer_core\">Outer core<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth\">Structure of the Earth<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Mass\">Mass<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Structure\">Structure<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Crust\">Crust<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Mantle\">Mantle<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Core\">Core<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Structure_of_the_Earth#Historical_development_of_alternative_conceptions\">Historical development of alternative conceptions<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><sup><a name=\"6\"><\/a>6<\/sup> Diamonds, science, and people:<\/p>\n<ul>\n<li>Wikipedia\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond\">Diamond<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond#History\">History<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond#Natural_history\">Natural history<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond#Material_properties\">Material properties<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond#Electrical_conductivity\">Electrical conductivity<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond#Industry\">Industry<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond#Synthetics.2C_simulants.2C_and_enhancements\">Synthetics, simulants, and enhancements<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond#Stolen_diamonds\">Stolen diamonds<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_(gemstone)\">Diamond (gemstone)<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_(gemstone)#History\">History<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_(gemstone)#Early_history\">Early history<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_(gemstone)#Modern_history\">Modern history<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_(gemstone)#Gemological_characteristics\">Gemological characteristics<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/List_of_diamonds\">List of diamonds<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Synthetic_diamond\">Synthetic diamond<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Synthetic_diamond#History\">History<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Synthetic_diamond#Manufacturing_technologies\">Manufacturing technologies<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Synthetic_diamond#Properties\">Properties<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Synthetic_diamond#Applications\">Applications<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><sup><a name=\"7\"><\/a>7<\/sup> Diamond stories, and a little more science:<\/p>\n<ul>\n<li>Wikipedia\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Carbonado\">Carbonado<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Carbonado#Unusual_properties\">Unusual properties<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Carbonado#Theories_on_origin\">Theories on origin<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Carbonado#Extraterrestrial_origin_hypothesis\">Extraterrestrial origin hypothesis<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_(gemstone)\">Diamond (gemstone)<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Diamond_(gemstone)#Symbolism_and_lore\">Symbolism and lore<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hope_Diamond\">Hope Diamond<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hope_Diamond#Physical_properties\">Physical properties<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hope_Diamond#History\">History<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hope_Diamond#The_curse_controversy\">The curse controversy<\/a>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hope_Diamond#Superstitions.2C_publicity.2C_marketing\">Superstitions, publicity, marketing<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hope_Diamond#Owners_and_their_fate\">Owners and their fate<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Sergio_(carbonado)\">Sergio (carbonado)<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The Fire of Australia, a whacking great chunk of opal, isn&#8217;t particularly interesting from a &#8216;science&#8217; viewpoint. But I&#8217;m human, which is probably why anything big and shiny gets my attention: including that rock. Wrenching myself back on-topic, scientists found &hellip; <a href=\"https:\/\/brendans-island.com\/catholic-citizen\/gems-metal-and-earths-core\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[236,4,209],"tags":[50,124,113,7,27,114,22,88,28],"class_list":["post-810","post","type-post","status-publish","format-standard","hentry","category-diamonds-and-gems","category-science-news","category-series","tag-environmental-issues","tag-folklore-and-myth","tag-geology","tag-getting-a-grip","tag-history","tag-physics","tag-science","tag-superstition","tag-technology"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p7Dwtw-d4","jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/posts\/810","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/comments?post=810"}],"version-history":[{"count":5,"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/posts\/810\/revisions"}],"predecessor-version":[{"id":2006,"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/posts\/810\/revisions\/2006"}],"wp:attachment":[{"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/media?parent=810"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/categories?post=810"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/brendans-island.com\/catholic-citizen\/wp-json\/wp\/v2\/tags?post=810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}