| Term | Definition |
| Biome | Large geographic areas that have similar climates and ecosystems |
| Tundra | Cold, dry, treeless; the coldest biome |
| Taiga | Cold; precipitation mostly snow; has cone-bearing evergreen trees; the largest biome |
| Tropical Rainforest | Warm and wettest biome with the most diversity of life, both plants and animals; has four zones |
| Temperate Deciduous Forest | Moderate temperatures and rainfall; dominated by trees that loose their leaves every fall; the biome in which we live |
| Desert | The driest biome; can be hot or cold; supports little life |
| Savanna | Dominated by grasslands; has grazing animals; has a dry season preventing growth of forests |