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the oceanic crust being subducted is Basaltic. It goes through changes from pressure and temperature as it ids subducted. It goes from basalt to Amphibolite and finally at 100km depth eclogite. At the 100 km a lot of the water is forced out of the rock allowing the surrounding area to liquidize. Since it is liquid it is less dense then the solid area and rises. as it reached into the Continental or ocean crust it melts the surrounding area, and magma rises forming a volcano.

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