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Mt St Helens Topographic Map

Mount St. Helens U.S. Geological Survey. AğMount St. Helens is primarily an explosive dacite volcano with a complex magmatic system. The volcano was formed during four eruptive stages beginning about 275,000 years ago.

Mount St. Helens U.S. Geological Survey
Mount St. Helens U.S. Geological Survey from www.topozone.com

AğA location map of Mount St. Helens Volcano By Geology and Ecology of National Parks Original Thumbnail Medium Detailed Description A location map of Mount St. Helens.

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