Answer:
against
Explanation:
Reverse faults, also called thrust faults, slide one block of crust on top of another. These faults are commonly found in collisions zones, where tectonic plates push up mountain ranges such as the Himalayas and the Rocky Mountains.
The answer to your question is B.
The sahara made migrating rough because it was a desert but it was easier to pass through rather than south afria going through jungles
