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Discover the wonders of our earth with the Physical Geography DVD Series. The United States is fortunate to have active and dormant volcanoes in many of her western states. This DVD visits some of the most prominent volcanoes in America including: Craters of the Moon in Idaho, Mount Lassen in California and Mount St. Helen's in Washington. Subjects covered include: Where volcanic activity has taken place in the U.S., How volcanoes are classified, The difference between a Shield Volcano and a Composite Volcano, Why and where volcanoes occur along the Pacific Ocean's "Ring of Fire," Lava tube tunnels, lava fields and volcanic caves, Visualization of volcanic terms such as lava, lava bombs, ash, pyroclastic flows and pumice. Grades 9-12. 24 minutes on DVD.