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what are volcanoes

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guildford public

on 16 October 2013

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Transcript of what are volcanoes

Under the surface
what are volcanoes
A volcanoes is a mountain that has a big hole at the top where lava comes out . magma is in the bottom and changes colour and every year lava sometimes it erupt in country.a volcano is a mountain that opens downward to a pool molten rock below the surface of the earth. when pressure builds up eruption occur. Gases and rock shoot up through the opening volcanoes has a big hole where lava comes out of.
The structure of a volcano
A volcano has lava at the bottom and earth's crust is lays and magma and is shaped like a ice-cream cone when lava erupts lava comes out of volcano with dark clouds. The volcano at the bottom changes colour the volcano es are made of hardned lava
The eruption
Magma is pushed upward by expanding gases which are beneath it. As it moves up,it can be colder rock and layers or if the crust through which it is moving it cracked or shollow it can erupt through the surface.
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