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Volcanoes don't just happen! Volcanoes are from when two plates collide. Particularly when one plate goes underneath another. This type of plate interaction is called subducting. Actual volcanic eruptions can occur when two plates move away from each other and the pressure differential cause by this movement can force the magma out of the magma chamber and cause an eruption. This type of interaction between the African and Eurasian plates is what led to the 79 AD eruption of Mount Vesuvius.