• Terrence Aym
Gigantic eruptions from amazing "supervolcanoes" at the top of the world caused the largest mass extinction on Earth, scientists have declared. Supervolcanoes can be found around the planet and three exist in the United States, the most famous of them the Yellowstone Caldera. With the supervolcano at Yellowstone National Park in Wyoming showing signs of becoming more active, interest in the world's supervolcanoes is heating up. Yellowstone's supervolcano is showing ominous signs of becoming fully active again—since 2004 its dome has been rising steadily at the record rate of three inches a year.
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