Keeping an eye on Yellowstone's supervolcano

It's no mere doomsday pseudoscience: The Yellowstone supervolcano really could be the end of us all. When the Yellowstone Caldera ? the name of the national park's geographic structure, which roughly translates as "caldron" ? blows its lid, much of the continental United States will get covered in a blanket of ash. That ash will clog the atmosphere enough to block out the sun, disrupting the global climate enough to cause mass extinctions.

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