How Is a Volcano Formed?

Answer

A volcano is a vent through which molten rock known as magma rises from underground to the Earth's surface. Volcanoes are formed when magma from within the earth's upper mantle works its way to the surface. At the surface it erupts to form lava flow and ash deposits. Once lava or ash is pilled up around the vent, that is a young volcano but after many more eruptions it becomes a big volcano.
Q&A Related to "How Is a Volcano Formed"
Volcanoes form when magma from deep inside the Earth leaks up into the crust and forms a pool. It will eventually erupt causing lava to spill out. It is a lot of pressure that is
http://www.ask.com/web-answers/Science/Nature/how_...
One of 40 active volcanoes in Alaska, 3,497-foot-tall Mt. Amukta overlies an ancient shield volcano and dominates the tiny Aleutian Island of Amukta. The Aleutian Islands are a volcanic
http://www.ehow.com/info_8631618_amukta-volcano-fo...
They are formed when an oceanic plate goes under another oceanic plate. Causing it to go under to the mantle. Which causes it to burn making the magma turn into lava. Once the lava
http://wiki.answers.com/Q/How_are_composite_volcan...
Volcanoes form when tectonic plates push against each other. This is also how mountains are formed. In a volcano, magma goes through openings in the crust and shoots out of the volcano
http://wiki.answers.com/Q/Why+and+how+are+volcanoe...
2 Additional Answers
Ask.com Answer for: how is a volcano formed
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.
A volcano is formed when magma pushes up to the earth's surface. When the magma pushes up, the surface expands and grows. The more magma that pushes up, the bigger the formation can be. You can find more information here: http://www.windows.ucar.edu/tour/link=/earth/interior/volcano_formation.html
Explore this Topic
Volcanoes form over cracks and fissures in the earth's surface. These cracks allow ash, molten rock and a mixture of gases to escape to the surface. Most volcanoes ...
Volcanoes form by pressure that builds up underneath the Earth's surface. The part in the inside of the Earth where this activity happens is called the mantle. ...
Volcanoes form when magma, the hot, molten rock under the Earth's surface, upwells between tectonic plate boundaries (such as Iceland) or at hot spots (Yellowstone ...
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