YELLOWSTONE NATIONAL PARK, Wyo. - The Yellowstone caldera has been classified a high threat for volcanic eruption, according to a report from the     U.S. Geological Survey.
Yellowstone ranks 21st most dangerous of the 169 volcano centers in the United States, according to the Geological Survey's first-ever comprehensive review of the nation's volcanoes.
Kilauea in Hawaii received the highest overall threat score followed by Mount St. Helens and Mount Rainer in Washington, Mount Hood in Oregon and Mount Shasta in California.

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