The upper mantle drives the motion of the plates on Earths crust.
The movement of the mantle of earth drives the motion of the plates on Earth's crust.
The mantle is the second layer of the earth. It is below the crust and above the core. It is the most solid layer of the earth. Its movement causes the motion of the plates of the crust of the earth.
Thus, the layer is the mantle.
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