There are several ways in which a volcano can form, just as there are several different kinds of volcanoes. Volcanism is part of the process by which a planet cools off.
Hot magma, rising from lower reaches of the Earth, eventually, but not always, erupts onto the surface in the form of lava. During the eruption of a volcano, flowing lava and ash, forming a large cone. This cone is what we know as a volcano.
http://www.windows2universe.org/earth/interior/volcanos_general.html
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