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There is no such thing as a subduction boundary, there are divergent, convergent, and transform boundaries. When there is a continental-oceanic convergent boundary (when a continental plate and an oceanic plate smash together) the oceanic plate, because it is more dense sinks into deeper layers of the earth. The area where the two plates meet makes a trench which is a subduction zone. The oceanic plate will melt into the earth and because of the excess lava it rises out onto the continent and makes a volcanic mountain and the lava erupts.

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14y ago

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