{"id":12833,"date":"2021-07-20T21:36:44","date_gmt":"2021-07-20T21:36:44","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=12833"},"modified":"2021-07-20T21:36:44","modified_gmt":"2021-07-20T21:36:44","slug":"sailing-stones-of-death-valley-enigma-unraveled","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/ro\/science\/earth-science\/sailing-stones-of-death-valley-enigma-unraveled\/","title":{"rendered":"Pietrele enigmatice cu vele din Valea Mor\u021bii"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Pietrele cu vele enigmatice din Valea Mor\u021bii<\/h2>\n\n<h2 class=\"wp-block-heading\">Introducere<\/h2>\n\n<p>\u00cen inima Parcului Na\u021bional Valea Mor\u021bii se afl\u0103 o enigm\u0103 geologic\u0103 ce a captivat oamenii de \u0219tiin\u021b\u0103 timp de decenii: pietrele cu vele. Aceste roci misterioase alunec\u0103 f\u0103r\u0103 efort peste lacul sec Racetrack Playa, l\u0103s\u00e2nd \u00een urm\u0103 urme enigmatice \u00een nisip.<\/p>\n\n<h2 class=\"wp-block-heading\">Teorii istorice<\/h2>\n\n<p>De-a lungul anilor, au ap\u0103rut numeroase teorii pentru a explica mi\u0219carea pietrelor cu vele. Unii au sugerat c\u0103 ar putea fi responsabile furtunile de praf sau inunda\u021biile intermitente. Al\u021bii au propus c\u0103 for\u021ba motrice ar putea fi pl\u0103cile de ghea\u021b\u0103 sau v\u00e2nturile puternice.<\/p>\n\n<h2 class=\"wp-block-heading\">Experimentul de la masa din buc\u0103t\u0103rie<\/h2>\n\n<p>\u00cen 2006, omul de \u0219tiin\u021b\u0103 planetar Ralph Lorenz a dat peste pietrele cu vele \u00een timp ce instala sta\u021bii meteorologice \u00een Valea Mor\u021bii. Intrigat de comportamentul lor ciudat, a conceput un experiment simplu la masa din buc\u0103t\u0103ria sa. Lorenz a a\u0219ezat o mic\u0103 roc\u0103 \u00eentr-un recipient cu ap\u0103 \u0219i a \u00eenghe\u021bat-o. C\u00e2nd a \u00eentors pe dos hibridul roc\u0103-ghea\u021b\u0103 \u0219i l-a f\u0103cut s\u0103 pluteasc\u0103 \u00eentr-o tav\u0103 cu ap\u0103 \u0219i nisip, a descoperit c\u0103 putea face roca s\u0103 alunece pe tav\u0103 sufl\u00e2nd u\u0219or peste ghea\u021b\u0103.<\/p>\n\n<h2 class=\"wp-block-heading\">Modelul pl\u0103cii de ghea\u021b\u0103 plutitoare<\/h2>\n\n<p>Baz\u00e2ndu-se pe experimentul s\u0103u de la masa din buc\u0103t\u0103rie, Lorenz a propus modelul pl\u0103cii de ghea\u021b\u0103 plutitoare. Conform acestei teorii, un strat sub\u021bire de ghea\u021b\u0103 se formeaz\u0103 \u00een jurul unei roci, f\u0103c\u00e2nd-o s\u0103 devin\u0103 flotant\u0103. Nivelul lichidului se schimb\u0103, ridic\u00e2nd roca din noroi. Placa de ghea\u021b\u0103 plutitoare rezultat\u0103 ac\u021bioneaz\u0103 ca o barc\u0103 mic\u0103 cu o chil\u0103 orientat\u0103 \u00een jos, care sap\u0103 o urm\u0103 \u00een sedimentul moale pe m\u0103sur\u0103 ce placa de ghea\u021b\u0103 se mi\u0219c\u0103.<\/p>\n\n<h2 class=\"wp-block-heading\">Dovezi care sus\u021bin teoria<\/h2>\n\n<p>Modelul pl\u0103cii de ghea\u021b\u0103 plutitoare explic\u0103 mai multe observa\u021bii-cheie despre pietrele cu vele:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Urme paralele \u0219i neparalele:<\/strong> Modelul lui Lorenz explic\u0103 at\u00e2t urmele paralele, c\u00e2t \u0219i cele neparalele l\u0103sate de pietre. Urmele paralele indic\u0103 faptul c\u0103 pietrele erau \u00eencastrate \u00een aceea\u0219i plac\u0103 de ghea\u021b\u0103, \u00een timp ce urmele neparalele sugereaz\u0103 c\u0103 pietrele se mi\u0219cau independent.<\/li>\n<li><strong>Gulere de ghea\u021b\u0103:<\/strong> Oamenii de \u0219tiin\u021b\u0103 au observat gulere de ghea\u021b\u0103 \u00een jurul pietrelor cu vele, sus\u021bin\u00e2nd ideea c\u0103 ghea\u021ba joac\u0103 un rol crucial \u00een mi\u0219carea lor.<\/li>\n<li><strong>Viteze ale v\u00e2ntului:<\/strong> Calculele arat\u0103 c\u0103 vitezele v\u00e2ntului necesare pentru a mi\u0219ca pietrele cu vele conform altor modele ar fi prohibitiv de mari. Modelul pl\u0103cii de ghea\u021b\u0103 plutitoare, totu\u0219i, nu necesit\u0103 astfel de viteze extreme ale v\u00e2ntului.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Misterul persistent<\/h2>\n\n<p>\u00cen ciuda dovezilor conving\u0103toare care sus\u021bin modelul pl\u0103cii de ghea\u021b\u0103 plutitoare, misterul pietrelor cu vele persist\u0103. Rangerul Alan Van Valkenburg observ\u0103 c\u0103 mul\u021bi vizitatori ai Racetrack Playa prefer\u0103 s\u0103 men\u021bin\u0103 senza\u021bia de enigm\u0103 din jurul pietrelor. Ei g\u0103sesc alinare \u00een \u00eentreb\u0103rile f\u0103r\u0103 r\u0103spuns \u0219i \u00een spectacolul impresionant al acestor roci misterioase care alunec\u0103 prin peisajul de\u0219ertic.<\/p>\n\n<h2 class=\"wp-block-heading\">Atemporalitatea pietrelor<\/h2>\n\n<p>Pietrele cu vele se mi\u0219c\u0103 de milenii, c\u0103ile lor fiind gravate \u00een podeaua playa ca ni\u0219te hieroglife antice. Pe m\u0103sur\u0103 ce civiliza\u021biile umane se ridic\u0103 \u0219i cad, iar ora\u0219ele sunt construite \u0219i abandonate, pietrele \u00ee\u0219i vor continua c\u0103l\u0103toria perpetu\u0103, sculpt\u00e2ndu-\u0219i urmele enigmatice \u00een p\u0103m\u00e2ntul dur \u0219i plat. \u00cenghe\u021bate \u00een ghea\u021b\u0103 \u0219i \u00eempinse de cea mai mic\u0103 adiere de v\u00e2nt, ele stau ca o m\u0103rturie a puterii durabile a naturii \u0219i a minunilor infinite ale lumii naturale.<\/p>","protected":false},"excerpt":{"rendered":"<p>Pietrele cu vele enigmatice din Valea Mor\u021bii Introducere \u00cen inima Parcului Na\u021bional Valea Mor\u021bii se afl\u0103 o enigm\u0103 geologic\u0103 ce a captivat oamenii de \u0219tiin\u021b\u0103 timp de decenii: pietrele cu&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[212],"tags":[207,319,252,17344,16437],"class_list":["post-12833","post","type-post","status-publish","format-standard","hentry","category-earth-science","tag-geology","tag-mystery","tag-nature","tag-sailing-stones","tag-death-valley"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/12833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/comments?post=12833"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/12833\/revisions"}],"predecessor-version":[{"id":12834,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/posts\/12833\/revisions\/12834"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/media?parent=12833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/categories?post=12833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/ro\/wp-json\/wp\/v2\/tags?post=12833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}