Six hundred thousand years ago the largest volcano in the Western Hemisphere erupted covering much of what is now the Central United States in a thick layer of ash The cataclysm left behind a massive caldera that today is known as Yellowstone National Park and it s about to happen again After a meeting with the President, Milton Bainbridge, a Yellowstone volcanologist i Six hundred thousand years ago the largest volcano in the Western Hemisphere erupted covering much of what is now the Central U...
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