Tilling, Robert I. Branch of Igneous and Geothermal Processes, U.S. Geological Survey, Menlo Park, California.
Last reviewed:January 2017
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- Volcanic products
- Lava flows
- Pyroclastic materials
- Volcanic gases
- Volcanic aerosols
- Volcanic mudflows
- Volcanic landforms
- Major edifices
- Minor structures
- Submarine volcanism
- Fumaroles and hot springs
- Distribution of volcanoes
- Volcanoes on other planets
- Additional Readings
A mountain or hill, generally steep-sided, formed by accumulation of magma (molten rock with associated gas and crystals) erupted through openings or volcanic vents in the Earth's crust; the term volcano also refers to the vent itself. During the evolution of a long-lived volcano, a permanent shift in the locus of principal vent activity can produce a satellitic volcanic accumulation as large as or larger than the parent volcano, in effect forming a new volcano on the flanks of the old (Fig. 1).
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