Wha is the term for the circular movement of material inside earths mantel

Earth's tectonic plates are in constant motion. ... This causes hot material within the Earth to rise, until it reaches the surface where it moves sideways, cools, then sinks. This circular motion is called convection. Convection within the mantle drives the motion of the overlying plates.

Explanation:

answer; ///i believe that the correct answer is (d); ///

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