{"id":1343,"date":"2019-06-25T12:26:27","date_gmt":"2019-06-25T12:26:27","guid":{"rendered":"http:\/\/meumon.synology.me\/museu\/?p=1343"},"modified":"2023-08-04T12:07:09","modified_gmt":"2023-08-04T12:07:09","slug":"estudi-estructura-de-la-terra","status":"publish","type":"post","link":"http:\/\/meumon.synology.me\/museu\/estudi-estructura-de-la-terra\/","title":{"rendered":"Estudi de l&#8217;estructura de la terra"},"content":{"rendered":"<p><a href=\"http:\/\/meumon.synology.me\/museu\/4-inventari-tot\/44-la-terra\/44t-la-terra\/\">La terra, geografia<\/a>\u00a0 |<\/p>\n<p>[ una mica \u00e9s com endevinar qu\u00e8 hi ha en una capsa tancada picant i sacsejant-la des de fora]<\/p>\n<hr \/>\n<p>Des de l&#8217;antiguetat es tenia evid\u00e8ncia de certa activitat interna amb els <a href=\"http:\/\/meumon.synology.me\/museu\/volcans-terratremols\/\">volcans i terratr\u00e8mols<\/a><\/p>\n<p>1665 A l&#8217;obra <a href=\"https:\/\/archive.org\/details\/mundussubterrane00unse\">Mundus subterraneus<\/a> Athanasius Kircher l&#8217;imaginava amb coves que podien contenir aigua o foc.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large\" src=\"http:\/\/meumon.synology.me\/museu\/fonsimatges\/Mciencia\/Athanasius_Kircher_Interior_of_the_earth.jpg\" width=\"1068\" height=\"960\" \/><\/p>\n<p>1798 Cavendish calcula la densitat mitjana com a 5.5 vegades la de l&#8217;aigua<\/p>\n<p>1864 Jules Verne publica el <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Voyage_au_centre_de_la_Terre\">Voyage au centre de la terre<\/a><\/p>\n<hr \/>\n<p>1915 <a href=\"http:\/\/meumon.synology.me\/museu\/tectonica-de-plaques\/\">Hip\u00f2tesi de les plaques tect\u00f2niques de Wegene<\/a>r<\/p>\n<p>1920 Harold Jeffreys observa que a cada terratr\u00e8mol hi ha una zona de la terra on no arriben les ones, d&#8217;on es pot deduir que hi ha un nucli l\u00edquid. [AD Ciencia: 1900 Richard Oldham observa dos tipus d&#8217;ones en els terratr\u00e8mols, les P, que travessen s\u00f2lids i l\u00edquids, i les S que nom\u00e9s travessen s\u00f2lids. Les ones P arriben m\u00e9s tard del compte, cosa que implicaria un nucli molt dens.<\/p>\n<p>1936 Inge Lehman proposa que hi ha un nucli intern s\u00f2lid i un extern l\u00edquid en detectar ones P febles.<\/p>\n<p>La densitat mitjana de la terra a partir de Newton ha de ser de 5.5 mentre que la mitjana de les roques \u00e9s de 2.7. Aix\u00f2 vol dir que el nucli ha de contenir elements m\u00e9s pesants. Sabem tamb\u00e9 que hi ha magma fos per l&#8217;activitat volc\u00e0nica.<\/p>\n<p>D&#8217;aqu\u00ed es surt un <a href=\"http:\/\/meumon.synology.me\/museu\/la-terra-estructura\/\">model que proposa<\/a>:<\/p>\n<ul>\n<li>crosta continental: 9km b\u00e0sicament silicats i \u00f2xid d&#8217;alumini, temperatura -90\u00ba\/900\u00ba<\/li>\n<li>crosta oce\u00e0nica: 4-11 km, semblant, temperatura 0\u00ba\/400\u00ba<\/li>\n<li>Mantell superior: 11 a 660 km: roca s\u00f2lida o semis\u00f2lida, silicats i \u00f2xid de magnesi, temperatura 400\u00ba\/2000\u00ba<\/li>\n<li>Mantell interior: 660 a 2890km, roca semis\u00f2lida, semblant, temperatura 2000\u00ba\/4000\u00ba<\/li>\n<li>Nucli extern:\u00a0 2890 a 5150 km, ferro i n\u00edquel l\u00edquid, 4000\u00ba\/5000\u00ba<\/li>\n<li>Nucli intern 5150 a 6370 km, ferro s\u00f2lid, 5000\u00ba\/5500\u00ba<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>La terra, geografia\u00a0 | [ una mica \u00e9s com endevinar qu\u00e8 hi ha en una capsa tancada picant i sacsejant-la des de fora] Des de l&#8217;antiguetat es tenia evid\u00e8ncia de certa activitat interna amb els volcans i terratr\u00e8mols 1665 A l&#8217;obra Mundus subterraneus Athanasius Kircher l&#8217;imaginava amb coves que podien contenir aigua o foc. 1798 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/meumon.synology.me\/museu\/estudi-estructura-de-la-terra\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Estudi de l&#8217;estructura de la terra&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[601],"tags":[330],"anotacio":[],"civilitzacio":[],"spec":[],"aspecies":[],"Tema poesia":[],"_links":{"self":[{"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/posts\/1343"}],"collection":[{"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/comments?post=1343"}],"version-history":[{"count":0,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/posts\/1343\/revisions"}],"wp:attachment":[{"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/media?parent=1343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/categories?post=1343"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/tags?post=1343"},{"taxonomy":"anotacio","embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/anotacio?post=1343"},{"taxonomy":"civilitzacio","embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/civilitzacio?post=1343"},{"taxonomy":"spec","embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/spec?post=1343"},{"taxonomy":"aspecies","embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/aspecies?post=1343"},{"taxonomy":"Tema poesia","embeddable":true,"href":"http:\/\/meumon.synology.me\/museu\/wp-json\/wp\/v2\/Tema poesia?post=1343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}