GEOLOGY

Detailed explanation-1: -Expert-Verified Answer. The answer is A-ridge push and slab pull. Ridge push, also known as gravitational sliding, is the gravity pull on the lithosphere due to the higher elevation of the mid-ocean ridges.

Detailed explanation-2: -In the current understanding of plate motion the movement is driven by the weight of cold, older, dense plate material sinking into the mantle at deep ocean trenches and pulling the rest of the plate slab with them as gravity causes them to slide downwards.

Detailed explanation-3: -Beneath mid-ocean ridges, convection currents push mantle material upward. Ridge push is the force that is generated from uplifted oceanic crust along mid-ocean ridges being gravitationally pulled away from the ridge. This force acts in conjunction with the stronger slab pull and contributes to plate motion.

Detailed explanation-4: -Ridge push –magma rises as the plates move apart. The magma cools to form new plate material. As it cools It becomes denser and slides down away from the ridge. This causes other plates to move away from each other.

Detailed explanation-5: -plate tectonics (the Mid-Atlantic Ridge), known as ridge push, in the Atlantic Ocean. This push is caused by gravitational force, and it exists because the ridge occurs at a higher elevation than the rest of the ocean floor. As rocks near the ridge cool, they become denser, and gravity pulls them away…