One of the largest supervolcanoes in the world lies beneath Yellowstone National Park and scientists say activity there is increasing.Though the Yellowstone system, which spans parts of Wyoming, Montana and Idaho, is active and expected to eventually blow its top, scientists don’t think it will erupt any time soon. Supervolcanoes can sleep for centuries or millennia before producing incredibly massive eruptions that can drop ash across an entire continent.
Activity discovered at Yellowstone supervolcano – LiveScience – MSNBC.com
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