Idk A drought or not enough water?
Answer:
Rift valleys are Formed from either from the action of tensional forces in the crust or from the action of compressional forces!
And they move due to the force of gravity!
The block mountain (horst) is left standing higher above the sunken graben!
Stage 1: High Equilibrium
High birth rate and high death rate
Stage 2: Early Population Increase
Decreasing death rate, constant birth rate
Stage 3: Late Population Increase
Death rate stabilizes at a lower amount, birth rate decreases
Stage 4: Low Equilibrium
Low birth rate and low death rate
Read it carefully and slowly
I am not certain but I think it is numbers
