Carrying capacity is the theoretical maximum rate of population growth. It is the maximum population size that the environment can sustain. This means that it is the maximum number of individuals of given species that the evironment's resources can sustain. It is the population size that can have enough water, food, habitat and other resources in order to survive and live.
You read the map from the key
Ten million years from now, the African Rift valleys will resemble the current Red Sea.
~Hope this helps!
Steep mountain side will most likely have the greatest amount of surface runoff. The correct option among all the options given in the question is the third option. Low flat plains will not have a good surface runoff as there is no angle of descent for the water. Valleys often get the runoff water from the steep mountains and so the valleys cannot be a good place for surface runoff either. Sandy beaches absorb water but they are not places for good water runoff.