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Thursday, July 24, 2008 |
Thursday, July 24, 2008 |
Photo: Oldest Known Ocean Crust Found on GreenlandA newly discovered sheeted dike in Greenland has been dated to 3.8 billion years ago, pushing back by hundreds of millions of years evidence for plate tectonics in Earth's early history. Photograph © Science
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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