Yellowstone National Park sits atop one of the most studied volcanic systems on Earth, and the question of what a full-scale caldera-forming eruption would do to the United States draws enormous ...

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Millions of Americans travel to Yellowstone each year. Families wait for Old Faithful to erupt. Hikers move past steaming vents and colorful hot springs. Bison graze quietly across open valleys. It ...

Add Yahoo as a preferred source to see more of our stories on Google. This photo of a volcano in Iceland doesn't even begin to encapsulate the devastation that would happen if the Yellowstone volcano ...