Volcanoes

And How They Work

What is a Volcano?

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.                               

How do Volcanoes Form?

Deep inside Earth, between molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface the crust, and releases pent-up gases, volcanoes erupt.                                                                      

What Causes Volcanoes To Erupt?

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.                           

How Many Volcanoes are in the World?

There are around 1,510 'active' volcanoes in the world. We currently know of 80 or more which are under the oceans. 

Created By: Marili, Gabrielle, and Davanna