How did geography help shape Nubia?

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.