http___metro-portal.hr_znanstvenici-grand-canyon-je-puno-stariji_4093_1.xml
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Posts tagged Grand Canyon Filed under geology Grand Canyon Students College Rock hound Limestone Granite Filed under geology science rocks grand canyon stressface: The Grand Canyon is one of the natural wonders of the Earth, located in Arizona in the United States. Erosion caused by the Colorado River, which cuts through the middle of the canyon, has resulted in a majestic canyon and rock formations. Over the past 17 million years, as the canyon itself was uplifted, the Colorado River and its tributaries etched their way through the canyon and still flow today, exposing much of Earth’s geological history. When one visits the Grand Canyon, they are literally looking into the past, and seeing the layers of rock from past eras. See here for more stunning photos and photo credits. Filed under geology Grand Canyon photography nature landscape Arizona stressface: The Grand Canyon is one of the natural wonders of the Earth, located in Arizona in the United States. Erosion caused by the Colorado River, which cuts through the middle of the canyon, has resulted in a majestic canyon and rock formations. Over the past 17 million years, as the canyon itself was uplifted, the Colorado River and its tributaries etched their way through the canyon and still flow today, exposing much of Earth’s geological history. When one visits the Grand Canyon, they are literally looking into the past, and seeing the layers of rock from past eras. See here for more stunning photos and photo credits. Filed under geology Grand Canyon photography nature landscape Arizona postmodern-prometheus: Sometimes your brain can play little tricks. Under some lighting conditions the Grand Canyon does not look like a canyon at all. Instead, all you see are the arteries on a giant heart, as if someone were performing open heart surgery on Mother Earth. So often, in the search for truth in nature, human perception masks how things really are. Letter’s to Earth blog of NASA astronaut Don Pettit, currently living in the International Space Station. Filed under geology arizona astronaut earth grand canyon international space station space NASA
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Znanstvenici: Grand Canyon je puno stariji Grand Canyon, čudo prirode koje su milijunima godina klesale riječne vode, počeo se oblikovati prije 17 milijuna godina što ga čini gotovo triput starijim no što se ranije mislilo, tvrde znanstvenici. Među geolozima je općenito vladao konsenzus da je remek-djelo prirode koje je izdubila rijeka Colorado u Arizoni, staro oko 6 milijuna godina. Znanstvenici Sveučilišta New Mexico sada su, međutim, na osnovi mineralnih depozita na zidovima kanjona utvrdili da je Grand Canyon mnogo stariji. Stručnjaci su došli do zaključka da kanjon zapravo ima dvije povijesti, odnosno da se zapadna strana počela formirati prije oko 17 milijuna godina kada su vode iz prethodnice današnje rijeke Colorado započele spori proces erozije stijena. Istočni se dio počeo oblikovati prije oko šest milijuna godina, što je dosad bila procjena starosti cijelog kanjona. ’U biti se on oblikovao u dva dijela. Zapadni je dio prvi nastao i onda se spojio s istočnim Grand Canyonom kada je rijeka Colorado probila tok sve do Kalifornijskog zaljeva’, rekla je geologinja Carol Hill. Nalazi su objavljeni u časopisu Science. Čak i s posljednjim nalazima, Grand Canyon ostaje razmjerno nova geološka formacija s obzirom na 4,5 milijardi godina dugu povijest planeta. (HINA)