New information on Yellowstone Super-Volcano

AUG. 15, 1997 FILE PHOTO

An unidentified pair of visitors to Yellowstone National Park in 1997 photograph the Old Faithful geyser as it rockets 100-feet skyward in Wyoming.    Kevork Djansezian/AP

Molten rock beneath Yellowstone National Park much larger than previously believed, study finds.

The park’s super-volcano has the potential to erupt with a force about 2,000 times the size of Mount St. Helens, according to the study. The last Yellowstone eruption happened 640,000 years ago, according to the U.S. Geological Survey.

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