Wednesday, 13 June 2012

Volcanic Facts

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

Did you know?
The name "volcano" has its origin from the name of Vulcan, a god of fire in Roman mythology.
As pressure in the molten rock builds up it needs to escape somewhere. So it forces its way up “fissures” which are narrow cracks in the earths crust. Once the magma erupts through the earth’s surface it’s called lava.

There are around 1510 'active' volcanoes in the world. We currently know of 80 or more which are under the oceans

The Earth's crust is made up of huge slabs called plates, which fit together like a jigsaw puzzle. These plates sometimes move.
Between the Earth's crust and the mantle is a substance called magma which is made of rock and gases.
When two plates collide, one section slides on top of the other, the one beneath is pushed down.  Magma is squeezed up between two plates.

Did you know?
Volcanoes are like giant safety valves that release the pressure that builds up inside the Earth.

What is a volcano? 

A mountain with the hiccups.

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