The population of the sub Sahara desert will grow in the years to come and has been growing for a while now. I know this because in the graph the line is climbing at the same crate constantly.
Answer:
Erosion can make the soil more fertile by eliminating certain wasteful materials, and leaving behind a cleaner, more nutrient-rich soil that farmers can use to cultivate grows more easily, that lead to a higher yield. For example, erosion is a way that nature uses to eliminate rotting matter from the soil.
No, because as long as the under ground spring doesn't feed to much, it wont turn into a rain forest