Comment: 07:15 - 07:45 (00:30)
Source: Annenberg/CPB Resources - Earth Revealed - 6. Plate Dynamics
Keywords: "plate tectonics", "convergent plate", "oceanic crust", "continental crust", subduction, plate, mantle, convection, mechanism
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Our transcription: In the three types of plate convergence described, oceanic rock always sinks beneath continental rock because oceanic crust is typically denser and heavier than continental crust.
Once subduction starts, it may be sustained in part as the weight of a down-going slab drags the rest of the plate with it.
Subduction is also sustained by slow moving currents of hot mantle rock, which tug against the underside of the plate.
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Geology School Keywords
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