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    Welcome to the Land of Evil Spirits! reads a light-hearted brochure on Yellowstone National Park’s caldera, a simmering super-volcano that last vomited its magma reservoir about 640,000 years ago.

    Its blasts are one thousand times more powerful than the 1980 Mount St. Helens eruption!

    Apparently there have been more earthquakes lately than usual, so you thought it was worth checking out.


    Go to page 116.


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