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Amodena Volcanoes

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guildford public

on 16 October 2013

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Transcript of Amodena Volcanoes

Why Do Volcanoes Erupt?
What is a Volcano?
A volcano is a sort of mountain that has an opening at the top where the main vent can travel to so the lava or magma can get out. A volcano can be formed by the earth. There are lots of parts to a volcano such as the magma chamber that stores all the magma until it is needed. Then there is the vents, there is the main vent and the other vents where the magma can get to. Around the magma chamber is the earth's crust.
What's the Difference Between Lava and Magma?
Magma is inside the volcano and when it erupts it is called lava. Also magma is composed of moten rock and lava gets to the surface through the vent of the volcano.
What Causes the Magma to Rise to the Earth's Surface?

Well what is magma, magma is the melting of the mantle rocks. As the rocks move upwards (or have water added to them), they begin to melt a bit. These tiny blebs of melt continue moving upwards and coalesce into larger volumes that are still moving up. As they rise, gas molecules inside the magma come out to form bubbles. As the bubbles rise they grow bigger. Eventually the pressure from the bubbles is more stronger then the surrounding rock. The rock surrounding it fractures, which allows the magma to come out to the Earth's surface.
Amodena Salguero Beazley
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