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Why do Volcanoes erupt?

Victoria Smith

on 20 April 2010

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Transcript of Volcanoes

VOLCANOES As pressure in the molten rock builds up it needs to escape somewhere. So it forces its way up narrow cracks in the earths crust.

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.
What is the difference between lava and Magma?

Magma is liquid rock inside a volcano.

Lava is liquid rock (magma) that flows out of a volcano. Fresh lava glows red hot to white hot as it flows.

All our info has come from
the website
Once the magma erupts through the earth’s surface it’s called lava.
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