| A | B |
|---|
| Great Plains | Flat lands that gradually increse in elevation westward |
| Rocky Mountains | Contains the Continental Divide which determines directional flow of rivers |
| Basin and Range | Contains Death Valley, the lowest point in North America |
| Coastal Range | Contains fertile valleys |
| Coastal Plain | Broad lowlands providing many excellent harbors |
| Appalachian Mountains | Oldest mountain range in North America |
| Canadian Shield | Holds some of the oldest rock formations in North America |
| Interior Lowlands | Rolling flatlands with many rivers, broad river valleys, and grasy hills |
