What causes volcanoes?

Answer 1

Inside the earth's core there is a red-hot liquid rock, called magma.
Volcanoes happen when magma rises to the surface of the earth, which causes bubbles of gas to appear in it.
This gas can cause pressure to build up in the mountain, and it eventually explodes. When the magma bursts out of the earth, it is called lava.

Answer 2

What creates a volcano?

Volcanoes are a natural way that the Earth and other planets have of cooling off. Planets are warm in their mantles. Heat inside planets escapes towards their surfaces. For reasons that are not well understood, heat sometimes melts rocks, which then rise buoyantly toward the planet's surface. When the hot rocks - called magma - and included gases break through the crust, an eruption occurs. The buildup of ash and lava flows around the eruption hole (or vent) makes a volcano. Some volcanoes erupt for only a short time - a few days to weeks and never erupt again. Large volcanoes such as stratovolcanoes and shields erupt many thousands of times throughout their lifetimes of hundreds of thousands to a few million years.

Answer 3

Hades, Lord of the Underworld. J/K.

A volcano is an opening (or rupture) in the Earth's surface or crust, which allows hot, molten rock, ash, and gases to escape from deep below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.

Volcanoes are generally found where two to three tectonic plates pull apart or are coming together. A mid-oceanic ridge, like the Mid-Atlantic Ridge, has examples of volcanoes caused by "divergent tectonic plates" pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by "convergent tectonic plates" coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another (like the San Andreas fault). Volcanoes can also form where there is stretching of the Earth's crust and where the crust grows thin (called "non-hotspot intraplate volcanism"), such as in the African Rift Valley or the European Rhine Graben with its Eifel volcanoes).

Finally, volcanoes can be caused by "mantle plumes," so-called "hotspots;" these hotspots can occur far from plate boundaries, such as the Hawaiian Islands. Interestingly, hotspot volcanoes are also found elsewhere in the solar system, especially on rocky planets and moons.

Answer 4

A swelling of magma and Gas under the Earths Crust. Pressure causes the volcano to explode sometimes violently other times gooey. Raining Humus all over the surrounding country side.

Answer 5

What Causes Volcanoes?

Volcanoes formed in convergent boundaries of plates…

- happens when a plate carrying the ocean rock slides underneath a continental rock plate. - magma or lava melts and rises up from
the bottom of the continental plate from the
oceanic plate to the continental plate

- the magma builds up under pressure and
finally erupts through weak cracks, usually
mountains, in the continental plate. This
causes volcanoes.

Here is a web site with tons and tons of AWESOME, easy to understand answers about Volcanoes..
http://volcano.und.nodak.edu/vwdocs/frequent_questions/group10_new.html

Answer 6

when the ground cant hold the lava... it spits the lava to the outside!

Answer 7

http://en.wikipedia.org/wiki/Volcanos
http://science.howstuffworks.com/volcano.htm
http://volcano.und.nodak.edu/vwdocs/frequent_questions/grp10/question919.html