See other News & Comment articles from CBBC Newsround VOLCANOES What causes volcanoes.
What causes volcanoes Inside the earths core there is a redhot liquid rock called magma Volcanoes happen when magma rises to the surface of the earth which causes bubbles of gas to appear in it
Volcanoes are evidence of the powerful forces at work inside the Earth So what causes them
Are there different types of volcanoes The type of magma in the earth can create different volcanoes If the magma is quite thin the gas can escape easily and there will not be an explosion The magma just comes out of the mountain and flows down the sides like Volcanoe
Lava from Hawaii volcano eruption spills into ocean 29 July 2016 Last updated at 0838 BST
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