Volcanoes

It's already term 2 and we learnt about volcanoes. We(Esther and Jessica) were told to present about the factors and conditions affecting a volcano eruption.

 

What is a volcano?

A volcano is an opening in the Earth's crust which magma and gases can escape through it when pressure in the mantle forces magma to the surface.



What is magma?

Magma is also known as molten mantle.Molten mantle is caused when the temperature beneath the Earth's crust is so great that it causes parts of the mantle to melt.



Basic structure of the volcano

A volcano consists of a vent, crater, pipe and cone. The vent is an opening in the Earth's surface while the pipe is a channel which allows the magma to rise to the top of the volcano. The crater is a bowl-shaped opening on top of the volcano and the cone refers to the shape of the volcano.

Where can volcanoes be found?

Volcanoes can be found on the "Ring of Fire".

Active volcanoes:

A volcano which have erupted from time to time and is likely to do so again in the future.

Dormant volcanoes:

A volcano which is presently inactive but may erupt again.

Extinct volcanoes:

A volcano which scientists consider unlikely to erupt again.

Acknowledgements:

http://www.google.com/