USGS Science Topics: Mount St. Helens

Mount St. Helens

Active volcano in southwestern Washington, famous for its explosive eruption in May 1980. Subject of detailed studies by USGS.

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Volcanic activity(attribute)

Episodes during which gases, ash, and lava (molten rock) escape from vents in the earth's crust, accompanied by minor tremors.

Volcanoes(instance of)

Vents in the surface of the Earth through which magma and associated gases erupt; also, the forms or structures, usually conical, that are produced by the erupted material. [Glossary of Geology, 4th ed.]

Mount Saint Helens(location)

map quadrangle, 30x60 minute

Skamania(location)

county

Mountains(instance of)

Landmasses that project conspicuously above their surroundings. [USGS Circ 1048]