What processes drives motion of the plates? ( ! )

For much of the last quarter century, the leading theory of the driving force behind tectonic plate motions envisaged large scale convection currents in the upper mantle, which can be transmitted through the asthenosphere.

answer; i believe that the correct answer is (light);

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah