| Term | Definition |
| biome | a large region characterized by a specific type of climate and certain types of plants and animals communities |
| climate | the weather conditions, such as temperataure, precipitation.humidity and winds |
| latitude | the distance north and south of the equator |
| Altitude | the height of an object above sea level |
| tropical rain forest | forests that are located in a belt around the Earth's near the equator |
| buttresses | above ground root found on some trees |
| emergent layer | the top layer of a rain forest |
| canopy | the layer beneath the emergent layer and is considered the priamry layer of a rain forest |
| epiphytes | plants like orchid that use the entire surface of a tree as a place to live |
| understory | the layer of a rain forest directly below the canopy |
| temperate rain forest | forest that are characterized by a large amount of rain fall, high humidity and moderate temperature |
| temperate deciduous forest | are forest that contain trees that drop their leaves each fall |
| taiga | is the northern coniferous forest that stretches in a broad band across the Northern Hemisphere just below the artic circle |
| Savannas | grasslands that are located in tropical and subtropical areas near the equator and between tropicl rain forest nd desert biomes |
| temperate grasslands | a biome that is dominated by grassess and that have very few trees |
| Chaparral | a type of temerate woodland biome that is dominated by more broad-leafed evergreen shrubs than by evergreen tress |
| Desert | biomes that receive less than 25 cm of precipitation a year and have little or no vegetation |
| Tundra | a biome that is dominated by grasses. lichens and herbs that is located primarily north of the arctic circle |