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?"
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
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...
A volcano is a large mound of earth and rock which is actually a passage or rupture
http://www.chacha.com/question/how-does-a-volcano-...
Volcanoes are usually found where tectonic plates are diverging (pulling apart) or converging (coming together). A mid-oceanic ridge (Mid-Atlantic Ridge) has examples of volcanoes
http://wiki.answers.com/Q/How_do_volcanoes_form_at...
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 »
Difficulty: Easy
Source: www.ehow.com
Explore this Topic
Volcanoes form when magma reaches the Earth's surface, causing eruptions of lava and ash. ...
Shield volcanoes are formed from many layers of running lava. It then forms a cone. The main Hawaiian islands are the tops of underwater shield volcanoes. ...
Cinder cone volcanoes form when high temperatures and pressure melt rock deep inside the Earth. Once a large amount of magma forms, it rises until it reaches the ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com