| A | B |
| Water Cycle | A model that describes how water moves from the surface of Earth to the atmosphere and back to the surface again. |
| Precipitation | Any form of water that falls from clouds and reaches Earth's surface. |
| Evaporation | converting a liquid to gas |
| Condensation | converting a gas to liquid (forms clouds) |
| Transpiration | Evaporation of water from the leaves of a plant |
| Accumulation | process of water collecting in rivers, lakes, streams, oceans and other bodies of water |
| Runoff | water that flows over the ground surface rather than soaking into the ground |
| Groundwater | water that fills the cracks and spaces in underground soil and rock layers |