It depends on the area or how close they are to the equator or water
Wind influences precipitation patterns. Wind could be warm or cool, humid or dry. As they go over the mountains, they could get cooler and cooler until they could not anymore hold moisture that is when it precipitates and distributes water call shower. The cycle repeats itself and the wind is never cancelled out of the equation. The process repeats itself, it is a cycle.
I'm pretty sure it's Madagascar, because Alergia and Chad are both deserts in Sahara, and Madagascar isn't even on Africa its off the southeast of Africa so I hope this helped!
Parent rock is important in different cultures
Is this for the entire world or just The U.S.? If its the U.S. than its increased slightly.