USGS Science Topics > Specific things by name
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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Episodes during which gases, ash, and lava (molten rock) escape from vents in the earth's crust, accompanied by minor tremors.
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.]
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Landmasses that project conspicuously above their surroundings. [USGS Circ 1048]