| A | B |
| chaparral | small evergreen trees and low bushes found in a Mediterranean climate |
| delta | flat, low-lying plain formed at the mouth of a river by sediment deposited by flowing water |
| environment | physical conditions on the natural surroundings |
| floodplain | broad plain on either side of a river formed by sediment deposits during flooding |
| leeward | mountain side away from the wind |
| natural vegetation | typical plant life of an area without human interference |
| polar | high latitude zone above 66 1/2 degrees |
| precipitation | all forms of water that fall to the earth |
| rain shadow | region of reduced rainfall causing very dry desert-like land on leeward slopes |
| savanna | tropical grassland with scattered trees near the Equator |
| temperate | middle latitude zone reaching from 23 1/2 degrees to 66 1/2 degrees |
| tropical | low latitude zone reaching to 23 1/2 degrees |
| tundra | region where the temperatures are always cold with specialized plants |
| weather | condition of the bottom layer of the earth's atmosphere at any given time |
| windward | mountain side facing the wind |