What causes a volcano?

Answer

There are many effects that happen deep within the Earth that cause volcanoes. An example would be the buildup of the pressure of gases in the the magma of the Earth's crust, causing the magma to rise to the surface and erupt as lava.
Q&A Related to "What causes a volcano?"
Volcanoes are caused by the build-up of gas and lava beneath the earth's crust. The pressure from the gas, causes an eruption. Many islands are results of volcanoes.
http://www.ask.com/web-answers/Science/Nature/what...
http://en.wikipedia.org/wiki/Volcano.
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In most volcanic eruptions, several earthquakes generally hit an area before an eruption occurs. Mauna Loa is not different from other volcanoes in this respect. Thousands of earthquakes
http://www.ehow.com/about_6495541_did-mauna-loa-vo...
The smallest volcano in the world is said to only be as tall as a two story house. Cholula. It is called the Popocatepetl. There is another volcano though that is also said to be
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2 Additional Answers
Ask.com Answer for: what causes volcano
Volcanoes are created from a opening in the Earth's crust, which allows hot magma, ash and gases to escape. They form in the shape of cones, domes or simple fissures.
Volcano's are caused by a build up of pressures in the earth. Once the pressure becomes too great gasses and lava are pushed out from the molten corps.
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A volcano is an opening in the surface of a planet or crust and it enables hot magma, gases and volcanic ash to escape from below the surface. They are caused ...
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