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What are volcanoes?
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Asked 9/1/2010 3:52:37 AM
Updated 11/28/2014 10:19:25 AM
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This conversation has been flagged as incorrect.
Flagged by alfred123 [11/28/2014 10:14:03 AM], Edited by yumdrea [11/28/2014 10:19:25 AM]
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User: What are volcanoes?

Weegy: molten lava
Helopoh|Points 1001|

Question
Asked 9/1/2010 3:52:37 AM
Updated 11/28/2014 10:19:25 AM
2 Answers/Comments
This conversation has been flagged as incorrect.
Flagged by alfred123 [11/28/2014 10:14:03 AM], Edited by yumdrea [11/28/2014 10:19:25 AM]
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A volcano is a rupture on the crust of a planetary mass object, such as the Earth, which allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
Added 11/28/2014 10:14:14 AM
This answer has been confirmed as correct and helpful.
Confirmed by yumdrea [11/28/2014 10:19:18 AM]
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A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot magma, ash and gases to escape from below the surface.
Volcanoes are generally found where tectonic plates are diverging or converging. 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 East African Rift, the Wells Gray-Clearwater volcanic field and the Rio Grande Rift in North America.
Volcanoes can be caused by mantle plumes. These so-called hotspots, for example at Hawaii, can occur far from plate boundaries. Hotspot volcanoes are also found elsewhere in the solar system, especially on rocky planets and moons.

The word volcano is derived from the name of Vulcano, a volcanic island in the Aeolian Islands of Italy whose name in turn originates from Vulcan, the name of a god of fire in Roman mythology. The study of volcanoes is called volcanology, sometimes spelled vulcanology.
Added 9/1/2010 4:28:36 AM
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