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"
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
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volcanoes in Hawaii are formed by hot spots. hot spots are areas of constant volcano activity. They are derived from unusually hot areas in the mantle. The overlapping mantle forms
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Volcanoes can form at the boundaries of plates or in the middle of plates. At a boundary formed by separating plates, volcanoes can be created when molten rock flows to the surface
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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 when magma reaches the Earth's surface, causing eruptions of lava and ash. ...
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 ...
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