Volcanoes are formed when the earth’s tectonic plates rub together to create friction (similarly to an earthquake). When the plates rub together or collide, one plate often moves on top of another plate causing the rocks underneath (or part of the earth’s mantle) to heat up and melt, forming liquid magma. A volcano then erupts when too much gas is absorbed in the magma, creating pressure and causing the magma to rise.
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