Question

what causes the convection currents that affect crustal plates?
o the stillness of the molten material beneath earths crust
o the rising and falling of the molten material beneath earths crust
o the rotation and revolutign of earth
o the weight of the ocean on earths crust

Explanation:

Convection currents in the Earth's mantle are driven by the rising and falling of hot, molten material. This movement affects the overlying crustal plates. The stillness of molten material wouldn't cause currents, Earth's rotation and revolution don't directly cause these mantle - based convection currents, and the ocean's weight doesn't drive them either.

Answer:

the rising and falling of the molten material beneath Earth's crust