Why the Yellowstone Supervolcano Could Be Huge by Smithsonian Channel   3 years ago

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One of the world's largest supervolcanoes erupted 2.1 million years ago in Yellowstone, and then twice more there at intervals of roughly 660,000 years. Are we due for another one soon?

From: YELLOWSTONE SUPERVOLCANO
http://bit.ly/1GmIMF3

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