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.
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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