Formed at Destructive (Compressional) margins.
For example, the denser oceanic Nazca plate, subducts under and crushes theless dense continental South American plate; which cripples and folds upwards, creating fold mountains (Andes) and volcanos.
Another example is the formation of Mt. Etna, the northward moving African plate subducts under the southward moving Eurasian Plate.
What happens to create the volcanoes?
Well, the denser oceanic plate is pushed downwards, under the opposing plate into a "subduction zone". Great HEAT and PRESSURE melt the rock which forms a pool of magma (remember! magma is what we call lava when it is underground), and forces the magma along a crack upwards untill it erupts at the surface.
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