| Term | Definition |
| water cycle | the continous prosses by which water moves through the living and nonliving parts of the environment. |
| evaporation | when warm air carries the water molecules high into the atmosphere. |
| condensation | when water vapor condenses into droplets,which collect onto dust particals in the atmosphere. |
| precipitation | rain,snow,sleet,or hail. |
| transpiration | a significant amount of water vapor is given off through the leaves of plants. |
| surface runoff | water that runs off the surface into rivers,lakes,and oceans. |
| infiltration | some of the water that sinks into the ground and becomes part of the ground water. |
| absorption | some of the water that is absorbed by plants and trees. |