What exactly are volcanoes and why do they form?

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What exactly are volcanoes and why do they form?

Clip from Understanding  |  Discovery Science  |  November 25, 2010

Graphics explain what a volcano is, why they form in certain places on the earth and how plate tectonics are involved.

Graphics explain what a volcano is, why they form in certain places on the earth and how plate tectonics are involved.

Community clip
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