Science Focus
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Beneath the pine forests and hot springs of Yellowstone National Park is a huge chamber of magma, which by some measures makes the park's volcano the world’s largest. The last three eruptions at Yellowstone occurred 2.1 million, 1.3 million, and 640,000 years ago, respectively.
Scientists estimate that another mega-eruption — which would send billions of cubic meters of choking ash up to 15 miles in the air, blackening the skies and drastically changing the climate — could possibly occur in the next 100,000 years. Such an event would present a huge danger to human civilization...
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original post: http://theweek.com/article/index/259396/dont-sweat-the-supervolcanoes
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