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Why do Volcanoes erupt? Natalia

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guildford public

on 16 October 2013

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Transcript of Why do Volcanoes erupt? Natalia

What is a Volcano anyway? A Volcano is like a cone shape and has an opening on top and magma comes out of it. It can be an extinct, active or dormant Volcano. An extinct Volcano means that it erupted a long time ago but doesn't erupt. A dormant Volcano means that it hasn't erupted for years but may erupt soon. An Active Volcano is when it erupts nearly everyday. It can erupt anytime
Why do Volcanoes erupt??
First of all, before telling you why does a Volcano erupt, What is a volcano? You have to know what a Volcano is before you know further information.
What is the difference between magma and lava? Magma is when it is inside the Volcano. When the magma comes out it is called lava. It is called lava because when that hot magma comes out it cools the magma down. When it cools down it is called lava.
So that is how a Volcano erupts!
Since you know what a Volcano is, What does it look like? A Volcano looks like a mountain but it has magma inside. In the Volcano there is a magma chamber and the vents. This is what makes the lava come out. Since the magma is very hot, ashes form. It forms into an ash cloud The main vent is usually at the top . There is also a side vents.
Now the eruption. What causes the magma to come to the surface of earth? Magma rises to the surface due to lots of water to the rock. Overtime, the water and rock continues to build up and this will push the magma higher up. The pressure of the Volcano builds up inside underground until it can't hold any more so it bursts out
Dormant Volcano
Active Volcano
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