The force that probably propels the movement of the earth’s gigantic rock plates is

Gravity

Explanation:

The origin of the motion of the  earth’s gigantic rock plates is in the stream of materials that occur in the mantle, the so-called convection currents, and especially, in the force of gravity. Convection currents are produced by differences in temperature and density, so that hotter materials weigh less and rise, and colder materials are denser, heavier, and descend.

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explanation:

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.