The downward sliding characteristic of ridge-push is the result of
a. uneven heat distribution.
b. paleomagnetism.
c. gravity.
d. seafloor spreading.

The answer is C. The downward sliding characteristic of ridge-push is the result of gravity. Ridge-pus also known as sliding plate force is a mechanism for plate tectonics motion. Ridges in mid-ocean locations are elevated than the ocean floor, the gravity will cause the ridge to push the lithosphere.

Answer barren with few trees, in the northern hemisphere;