| A | B |
|---|
| fossil fuels | coal or gas that is formed from the remains of living organisms |
| carbon cycle | circulation of carbon between living organisms and their environment |
| water cycle | circulation of water between the Earth's oceans, atmosphere, and land |
| precipitation | rain, sleet, or hail that falls to ground |
| respiration | the action of breathing |
| decomposition | the breaking down of wastes and the bodies of dead organisms |
| photosynthesis | the process by which green plants use sunlight, carbon dioxide, and water to make food |
| condensation | when water vapor cools and changes back into tiny drops of water |
| evaporation | when water is heated up it changes from a liquid to a gas |
| transpiration | the process in which the leaves of plants give off water vapor |
