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destructive margin  When crustal plates meet, and one plate is denser than the other, the denser plate is forced under the other plate (at the subduction zone) and melts to form magma. If both plates are of equal density they collide and crumple up against each other forming mountains. | In plate tectonics, the boundary between two lithospheric plates, along which crust is being destroyed. The term refers to a subduction zone, a type of convergent margin in which an oceanic plate subducts (dives) into the mantle beneath a continental plate or another oceanic plate. |
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