Why do volcanoes erupt?

Volcano
Why do volcanoes erupt?
The Earth's crust is made up of huge slabs called plates, which fit together like a jigsaw puzzle. These plates sometimes move. The friction causes earthquakes and volcanic eruptions near the edges of the plates. The theory that explains this process is called plate tectonics. -->
What are plate tectonics?
The theory of plate tectonics is a interesting story of continents drifting from place to place breaking apart, colliding, and grinding against each other. The plate tectonic theory is supported by a wide range of evidence that considers the earth's crust and upper mantle to be composed of several large, thin, relatively rigid plates that move relative to one another. The plates are all moving in different directions and at different speeds. Sometimes the plates crash together, pull apart or sideswipe each other. When this happens, it commonly results in earthquakes

What is an ACTIVE volcano? What is a Dormant volcano?
There are three different types of volcanoes; Active, Dormant, and Extinct.
Active volcanoes are ones that have recently erupted.
A dormant volcano is one that has not erupted in current historic times, but is thought to still be able to erupt.
Extinct volcanoes have not erupted in tens of thousands of years and it is believed they will not erupt again.

http://www.universetoday.com/27333/types-of-volcanoes/


http://www.weatherwizkids.com/weather-volcano.htm

http://www.mnh.si.edu/earth/text/4_0_0.html


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