Question

The great rift valley was formedin part by:
A)shifting tectonic plates
B)erosion by massive glaciers
C)wind erosion
D)human engineering

my choice is a

Answer 1

A is correct. I refers to an active tectonic area that extends from East Africa across the Red Sea to Syria.

Answer 2

The great rift is caused by spreading apart of the surface which is subsequently further deepened by the forces of erosion. So A is your answer.