Waiting To Erupt - Earth.com Waiting To Erupt

The Yellowstone volcano last erupted some 640,000 years ago, according to experts. So does that mean that another explosion is long overdue? There are certainly those who think so. And if such a cataclysmic event does happen, it could wreak havoc across the United States and result in millions of deaths. Photo credit:
Smith Collection / Gado / Getty Images

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