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Volcanoes form where there is a large channel in the Earths crust that allows magma from the core to make its way towards the surface. Eventually over time, pressure will build due to the flow of the magma. When this happens, it will errupt causing tremendous upward pressure and release of gasses and lava. The lava will build up over time and form the common "cone" shape. There are other types of volcanoes though which are so large they are more like a massive opening in the crust than the traditional cone shaped volcano.

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13y ago

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