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What causes a volcanic eruption?

User Niyas
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When a part of the earth's upper mantle or lower crust melts, magma forms. ... Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.

User Jenjis
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