how+are+volcanos+made

HOW ARE VOLCANOS MADE?

Volcanoes are usually made when two [|tectonic plates] come together. When these two plates meet, one of them (usually the Oceanic Plate) goes under the Continental Plate. Afterwards, it melts and makes [|magma] (inside the magma chamber), and the [|pressure] builds up until the magma bursts through the Earth's crust.

http://simple.wikipedia.org/wiki/Volcano