Explain the positive impact if having food security in south Africa​

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Answer (a) the itcz comes overhead for part of the year; i believe this is correct,plz check first; ///