America's Dangerous Volcanoes

America's Dangerous Volcanoes 09/01/2010
It has been thirty years since Mount Saint Helens reawakened, but what other volcanoes pose the threat of lava flows, toxic gases, volcanic ash, and mudflows? Bill Burton of the U.S. Geological Survey Volcano Hazards Program discusses the efforts being made by the federal government to monitor volcanoes in the Pacific Northwest, Hawaii, and Yellowstone for eruptive activity.

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