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What makes Mount St. Helens a composite volcano?

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Before 1980, snow-capped, gracefully symmetrical Mount St. Helens was known as the "Fujiyama of America." Mount St. read more

1795 Map, Pacific Northwest and the Columbia River (section of original). (Click to enlarge). Includes the Columbia River ("River Oregan"), Mount Rainier, Mount St. Helens, and Mount Hood, and Point Vancouver. read more

Mt. St. Helens is considered a composite or Strato-Volcano due to the type of magma it erupts. The volcano is primarily composed of Andesite, a medium consistency magma. This medium viscosity magma makes it possible for both explosive and docile eruptions from the volcano. read more

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Volcanoes Not just one type What are volcanoes? Where do ...
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Earth Facts and Information
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Mount St Helens
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Mount St. Helens
volcanoes.usgs.gov