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  • Magma expanse under Yellowstone supervolcano

    Yellowstone National Park

    Getty Images

    As tourists stroll between Yellowstone's 300 active geysers, taking selfies in front of thousands of bubbling, boiling mud pots and hissing steam vents, they are treading on one of the planet's greatest time bombs.

    The park is a supervolcano so enormo...

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    By Ben Brumfield CNN

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