| A | B |
|---|
| Physical Feature | The natural landscape of an area |
| Climate | A weather condition of a particular region |
| Flatland | land with no hills, valleys, or mountains |
| Erosion | Soil, rock, or land that is gradually worn down by natural agents |
| Great Plains | A vast area of plains east of the Rocky Moumntains in North America |
| Invention | A process or device |
| Adaptation | to become adjusted to new conditions |
| Perception | The process of becoming aware of something |
| Westward Expansion | The movement of people beyond the frontier due to the Homestead Act, transcontinental railroads, and the discovery of gold and silver |
| Transcontinental Railroad | A railroad that stretches across the continent |
| Homestead Act of 1862 | a law that offered free farmland on the Great Plains to anyone who agreed to work the land for 5 years |
| Reservation | An area set aside for Native American use |
| Agrarian Society | A society based on farming for its economic base |
