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trench. Because it contains thick continental crust, this lithosphere is less dense than the underlying asthenospheric mantle and normal subduction is disrupted. The volcanic arc on the upper plate is slowly extinguished. Resisting subduction, the continental crust buckles up and under, raising mountains where a trench used to be. However, a continental plate with subducted ocean lithosphere attached to it can start to be subducted from the pull the oceanic lithosphere's

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