| A | B |
| Evaporation | When water changes from a liquid to a gas. |
| Condensation | When a gas changes to a liquid. (How clouds are formed) |
| Precipitation | When the water vapor becomes heavy drops and falls back to earth as rain, snow, sleet, or hail. |
| Carbon | The building block for all living things. |
| Sugar or Glucose | C6H12O6 |
| Transpiration | The process by which water is lost through a plant's leaves |
| Oxygen | O2 |
| Combustion | The burning of fossil fuels |
| Respiration | The process by which cells break down simple sugars to release energy. |
| Photosynthesis | When producers use water, light, and Carbon Dioxide to make their own food. |
| Carbon Dioxide | CO2 |
| Infiltration | When water seeps into the small spaces between rocks an soil. |
| Decomposition | To break down wastes and dead organisms to release carbon back into the environment |
| Water | H2O |