write short noyes of volcano
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A volcano is a mountain that has lava ( hot , liquid rock ) coming out from a magma chamber under the ground, or did have in the past . Volcanoes are formed by the movement of tectonic plates . The Earth's crust is broken into 17 major , rigid tectonic plates . These float on a hotter , softer layer in its mantle . Volcanoes are often found where tectonic plates are moving apart or coming together . Volcanoes can also where there is stretching and thinning of the crust,s plates , for example, in the East African Rift
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