| A | B |
|---|
| physical features | 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 areas of plains east of the rocky mountains in north america |
| inventions | a process or device |
| adaptation | to become adjusted 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 | an 1862 law that offered free farm land on the great plains to anyone who agreed to work the land for 5 years |
| migration | a number of people or animals moving together from one place to settle in another |
| reservation | an area set aside for native american's use |
| conservation | to regulate or manage the wealth of nature for future use |
| agrarian society | a society based on farming for its economic base |
