This is a plate margin where two plates are moving towards each other resulting in one plate sinking beneath the other.
Convection currents in the mantle cause the plates to move together. If one plate is made from oceanic crust and the other from continental crust, the denser oceanic crust sinks under the lighter continental crust. This is called subduction.
If two continental plates meet each other, they collide rather than one sinking beneath the other. This collision boundary is a different type of destructive margin.
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