What is the cause of volcanic eruption?

Answer 1

See for yourself:

http://www.solcomhouse.com/volcano.htm
http://volcano.und.edu/vwdocs/frequent_questions/group10_new.html
http://www.exn.ca/volcanoes/causes.cfm
http://vulcan.wr.usgs.gov/Outreach/AboutVolcanoes/where_do_volcanoes_occur.html
http://library.thinkquest.org/10136/volcano/volctq.htm
http://en.wikipedia.org/wiki/Volcano

More random links I keep at hand for God knows what uses.

Answer 2

How volcanoes form

1. Magma rises through cracks or weaknesses in the Earth's crust.

2. Pressure builds up inside the Earth.

3. When this pressure is released, magma explodes to the surface causing a volcanic eruption.

4. The lava from the eruption cools to form new crust.

5. Over time, after several eruptions, the rock builds up and a volcano forms.

An eruption occurs when pressure in the magma chamber forces magma up the main vent, towards the crater at the top of the volcano. Some magma will also be forced out of the secondary vent at the side of the volcano.

Answer 3

The cause of a volcanic eruption is from tectonic plates, and a convergent boundary (two plates colliding) most of the time oceanic/continental plates, or continental/ continental plates. When both of these plates collide, the heavier, and therefore older plate subducts (is pushed beneath) the younger one. When this happens, the older plate melts, when it enter the mesosphere.

Answer 4

Geology is an interesting subject: every foot note is pretty lengthy! simple answer for you, is underground pressures and the heat generated, together pushing out hot liquid eruption through crevices at great force!

Answer 5

Too much lava inside earth's core.

Answer 6

pressure and heat