Volcanoes are mountains but they are very different from other mountains; they are not formed by folding and crumpling or by uplift and erosion. Instead, volcanoes are built by the accumulation of their own eruptive products -- lava, bombs (crusted over ash flows, and tephra (airborne ash and dust). A volcano is most commonly a conical hill or mountain built around a vent that connects with reservoirs of molten rock below the surface of the Earth. The term volcano also refers to the opening or vent through which the molten rock and associated gases are expelled.

   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.
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Principal Types of Volcanoes
Where do they erupt?
How volcanoes affect the surrounding environment and people.
Effects of Eruptions
 

This project was done by: Jolin Lin (10) & Maygalai Tangarasu (11) from Sec 1B