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Bookmark or Share- Anatomy of a Volcano - Volcanoes, Craters & Lava Flows (U.S. National ...Volcanoes are both the vents where molten rock material and volcanic gases are erupted from within Earth’s interior, and the cones and mountains built up around those vents. But beyond this simple definition, volcanoes are incredibly diverse with some types being very complex.
- About Volcanoes | U.S. Geological Survey - USGS.govMolten rock below the surface of the Earth that rises in volcanic vents is known as magma, but after it erupts from a volcano it is called lava. Magma is made of molten rock, crystals, and dissolved gas—imagine an unopened bottle of soda with grains of sand inside.
- Volcanic Eruptions - Volcanoes, Craters & Lava Flows (U.S. National ...Some volcanic eruptions consist of mostly gas emissions, others are relatively quiet discharges of fluid lava, and yet others are cataclysmic explosions. Different kinds of eruptions leave characteristic deposits that, in turn, build different types of volcanoes.
- Lava | Types, Composition, Temperature, & Facts | Britannicalava, magma (molten rock) emerging as a liquid onto Earth’s surface. The term lava is also used for the solidified rock formed by the cooling of a molten lava flow. The temperatures of molten lava range from about 700 to 1,200 °C (1,300 to 2,200 °F).
- California has active and hazardous volcanoesAt least seven California volcanoes—Medicine Lake Volcano, Mount Shasta, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, and Salton Buttes - have partially molten rock (magma) deep within their roots, and research on past eruptions indicates they will erupt again in the future.
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