Question

what mechanism within the earths mantle causes the plates to move?
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Explanation:

The movement of tectonic plates is caused by convection currents in the Earth's mantle. The mantle is semi - molten, and heat from the Earth's core creates convection currents where hot, less - dense material rises and cooler, denser material sinks. These currents exert forces on the overlying tectonic plates, causing them to move.

Answer:

Convection currents in the Earth's mantle (where heat - driven movement of semi - molten mantle material creates forces that move the tectonic plates)