| Term | Definition |
| water cycle | how water changes form (solid, liquid |
| precipitation | water falling from the sky (rain, snow, sleet, hail) |
| condensation | water vapor gas cools, collects as a liquid, and sticks to a solid surface |
| evaporation | when liquid water is heated and turns to water vapor (gas) |
| infilatration | surface water moves down through the soil |
| uptake | when plants move water from the soil up to its roots |
| transpiration | when plants release water into the air through its leaves-sweating |
| runoff | precipitation runs over the ground and collects in surface water |
| ground water | water found underground |