| A | B |
|---|
| nitrogen cycle | the cycle in which nitrogen gas is changed into forms of nitrogen that plants can use |
| carbon-oxygen cycle | the process by which carbon and oxygen cycle among plants, animals, and the environment |
| respiration | the process that releases energy from food |
| water cycle | the cycle in which Earth's water moves through the environment |
| evaporation | the process by which a liquid changes into a gas |
| condensation | the process by which a gas changes back into a liquid |
| precipitation | any form of water that falls from clouds, such as rain or snow |
| transpiration | the process in which plants give off water through their stomata |
