How does a volcano form?

Answer

A volcano forms when rock from inside the Earth melts, moves to the surface and erupts along with releasing ash and pent-up gases. This melted rock is called magma until it reaches the surface; then it is called lava.

Volcanoes can erupt in several different ways, which produces different physical forms. Stratovolcanoes are cone-shaped and steep and form when tectonic plates collide. Lava and other materials build up around the volcano's opening during an eruption.

Calderas occur when the top of a volcano collapses due to the strength of the eruption. Calderas are huge pits. Yellowstone National Park has a caldera volcano.

Shield volcanoes form when lava escapes through a rift where tectonic plates pull apart. This lava flow forms rounded, wide volcanoes that resemble shields.

Q&A Related to "How does a volcano form?"
A volcano looks like a huge mountain except with a hole in the middle. volcanoes are formed when magma rises to the earth's crust and is released and forms a dome shape mountain.
http://www.ask.com/web-answers/Science/Nature/how_...
Volcanoes are generally found where tectonic plates are pulled apart or come together. A mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by
http://wiki.answers.com/Q/How_does_a_volcano_form
Magma Pressure and high temperatures beneath the earth's crust causes rocks to melt down. Melted rock turns into a liquid form known as magma, and this magma is constantly trying
http://www.ehow.com/how-does_4620070_a-volcano-eru...
it was formed by molten lava from the valcano around it and by plates it erupts every 1 min.
http://wiki.answers.com/Q/How_was_kilauea_volcano_...
1 Additional Answer
Ask.com Answer for: how does a volcano form
How Does a Volcano Form?
A volcano is a large mound of earth and rock which is actually a passage or rupture through the earth's crust leading to liquid hot deposits of magma within the earth's mantle. It is believed that volcanoes are the primary source of land development in... More »
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Explore this Topic
Volcanoes form when magma reaches the Earth's surface, causing eruptions of lava and ash. ...
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