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supervolcano yellowstone 2012 5 31

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Supervolcanoes, like Yellowstone's, may take only centuries to form and erupt
Supervolcanoes, like Yellowstone's, may take only centuries to form and erupt
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supervolcano yellowstone 2012 5 31

View of the "Sunset Lake" hot spring in the Yellowstone National Park, Wyoming on June 1, 2011.

MARK RALSTON
AFP/Getty Images