| A | B |
|---|
| Ecosystem | Environment in which organisms live |
| Biotic | Features of the environment that are alive, or were once alive. |
| Abiotic | Nonliving, physical features of the environment. |
| Atmosphere | Air that surrounds Earth. |
| Soil | Mixture of mineral and rock particles, humus, water, and air. |
| Humus | Decaying matter in the soil. |
| Sunlight | Energy source for almost all life on Earth. |
| Climate | An area's average weather conditions over time. |
| Rainshadow Effect | Explains how mountains can have forests on one side and deserts on the other. |
