America's Volcanoes: Sitting on a Powder Keg Worksheet Movie Summary: Journey into the volatile world of volcanic activity across the United States. Witness the geological forces at work, from the explosive eruptions of Mount St. Helens to the simmering calderas of Yellowstone. Explore the potential risks, the... (more details for America's Volcanoes: Sitting on a Powder Keg *)

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File #709 Info: Created by Marschal Fazio on May 28, 2009 using California State standards for students at a grade 9-10 level.

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