- Created when sediments from the Shield and the Rocky Mountains were deposited in shallow inland seas and compressed into layers of sedimentary rock.
- The land has large flat grassy prairies, with deep, fertile soil.
- The region has short, hot summers and long, cold winters.
- Farmers now use this land to produce grain and to raise livestock. It is the largest farming area in the world. Many fossil deposits, along with oil, natural gas, coal, and other minerals have been found underground.