Answer:
European settlers and Americans transformed the Great Plains from natural grassland to fields of corn.
Explanation:
The Great Plains are a vast portion of prairies with just a few trees. When worked correctly, it can be transformed into great fields for agriculture.
The Sahara desert is important for a multiple of reasons. One is that although it is a desert, there are many fertile areas of land making it great for farming and supporting life. It also acts as a natural barrier in between north and south Africa, which was able to impact trade with the South, slowing down innovation on both sides.
1. Crust
2. Mantle
3. Inner core
4. Outer core