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Sunday, July 6, 2008 |
Sunday, July 6, 2008 |
Photo: World's Greatest Extinction Not Caused By Toxic GasesBut a new study finds that hydrogen sulfide probably couldn't reach high enough levels in the atmosphere to destroy the ozone layer, prompting scientists to come up with a new explanation for the biological cataclysm. Image by Nicolle Rager, National Science Foundation, based on Pangaea map data, Paleogeographic Atlas Project, University of Chicago
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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