The process of heat transfer thought to be responsible for the movement of the lithospheric plates on the surface of the earth is

Convection

Explanation:

In geology the convection is the process of transfer of heat that occurs due to the movement of the molecules in bulk within the fluids that can be in the form of gases or liquids, also involving the molten rock. The transfer of the heat below the rocks can cause the movement of lithospheric plates specially on the surface of earth.

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