The sinking of cold ocean lithosphere directly drives the motion of mantle convection, through slab pull and ridge push. some scientists think mantle planes are created in the upward flow of rock in the mantle.
Slab Pull: The force of gravity pulls old ocean lithosphere which is cold and dense, down into the deep mantle.
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Ridge Push: The stiff ocean lithosphere slid down the asthenosphere that is elevated near mid- ocean ridges.
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