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provides answers to questions about volcanoes, an educator's guide to "Living with a Volcano in your Backyard," information about volcanoes in America's past (by state), how scientists study volcanoes, how to become a volcanologist, careers, and more. (U.S. Geological Survey)
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The eruptive history of Mount St. Helens (Washington) began about 40,000 years ago with dacitic volcanism, which continued intermittently until about 2,500 years ago. This activity included numerous explosive eruptions over periods of hundreds to thousands of years, which were separated by apparent dormant intervals ranging in length from a few hundred to about 15,000 years. |
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Mount McLoughlin |
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