Why Do Volcanic Eruptions Happen?

Answer

Volcanic eruptions occur when the plates of the earth pull apart thus causing magma to rise to the surface. Volcanoes can as well occur over hotspots and where a plate dives under another, forcing the magma to ascend to the surface.
Q&A Related to "Why Do Volcanic Eruptions Happen"
The volcano will smoke and give off ash.Lava may flow out of the vent of the volcano.
http://wiki.answers.com/Q/What_happens_in_a_volcan...
Pyroclastic flows are superheated ash that flow down the flanks of a volcano. Ash is very small particles of volcanic rock and gas. Magma is molten rock before it reaches the surface
http://answers.yahoo.com/question/index?qid=201003...
A volcano is an opening, or rupture, in a planet's surface or crust, which allows
http://www.chacha.com/question/why-do-volcanic-eru...
Volcanoes can be found all over the world; some are dormant, some active and others extinct. The reason why these volcanoes exist or have existed is because molten rock, called magma
http://www.ehow.com/info_8208742_causes-volcanic-e...
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