volcano

n. vent in the earth's crust through which molten rock is ejected; mountain comprising such a vent

A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.Volcanoes are generally found where tectonic plates pull apart or come together. A mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by "divergent tectonic plates" pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by "convergent tectonic plates" coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another. Volcanoes can also form where there is stretching and thinning of the Earth's crust (called "non-hotspot intraplate volcanism"), such as in the African Rift Valley, the Wells Gray-Clearwater Volcanic Field and the Rio Grande Rift in North America and the European Rhine Graben with its Eifel volcanoes.
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Volcano is a disaster action film starring Tommy Lee Jones, Anne Heche, and Don Cheadle. It was directed by Mick Jackson, and was released in the United States on April 25, 1997, just months after the release of Dante's Peak, another film about a volcano with a similar plot. Geologists consider Volcano to be scientifically inaccurate compared to Dante's Peak.
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volcano! is a three-piece rock band from Chicago, Illinois that draw on influences ranging from Classic Rock, Post Punk, Free Jazz and Noise Rock. The Leaf Label released the trio's critically acclaimed debut, Beautiful Seizure, in the USA in late 2005 and worldwide in early 2006.
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(n.)
A mountain or hill, usually more or less conical in form, from which lava, cinders, steam, sulphur gases, and the like, are ejected; -- often popularly called a burning mountain.
  

Volcano [It from Latin Vulcanus the fire god] Small special manifestations of the general, large-scale phenomenon of volcanism, by which the continents are cyclically subjected to catastrophes, alternatively with the cyclic cataclysmal deluges. The geological record contains proofs of volcanism in the vast outpourings of lava-sheets now found interstratified with the sedimentary rocks. It is the physical manifestation of the work of the kabeiroi, whose father was Vulcan or Hephaestos.
From another standpoint, volcanic phenomena are outlets of energy of various kinds which accumulate under the surface of the globe, dissipating the dangerous accumulations. But for these outlets, the earth would be subjected to far more severe catastrophic changes than those now known to have occurred, and which to a certain extent are still occurring.

The solid structure created when lava, gases, and hot particles escape to the Earth's surface through vents. Volcanoes are usually conical. A volcano is "active" when it is erupting or has erupted recently. Volcanoes that have not erupted recently but are considered likely to erupt in the future are said to be "dormant." A volcano that has not erupted for a long time and is not expected to erupt in the future is "extinct."