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