A volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet. In simple terms a volcano is a mountain that opens downward to a pool of molten rock (magma) below the surface of the earth. It is a hole in the Earth from which molten rock and gas erupt.  

Learn more about them on the site:http://www.primaryhomeworkhelp.co.uk/mountains/volcanoes.htm

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