Yellowstone Caldera

Yellowstone National Park is famous worldwide for features like geysers and hot springs. These spectacular phenomena are caused by geothermal activity deed under the park. There is a huge lake of magma—molten rock—under the Park, called the Yellowstone Caldera. It is big, very big. It is a chamber 50 miles long and 12 miles deep, containing enough magma to fill the Grand Canyon 10 times over. The heat accounts for Yellowstone’s hot springs and many other features. It’s the same principle as any volcano, only vastly bigger. Yellowstone has blown in the past, the last time 631,000 years ago. If it blows again, it will cause catastrophic damage, enough to destroy most of the US economy and a huge proportion of the population. The United States Geological Survey estimates that the chances the Yellowstone Caldera will blow to be 1 in 730,000.

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