| Term | Definition |
| freshwater | all of the water is 2%on the earth |
| meteoric water | water that returns to the ocean |
| groundwater | water that soaks into the soil |
| latent heat of melting | heat change to the solid from a substance |
| condensation | change from a vapor to a liquid |
| freezing | liquid changes to solid |
| melting | solid changes to a liquid |
| sublimation | change from a solid to a gas |
| evaporation | change from a liquid to a gas |
| evapotranspiration | combination of evaporation and transpiration that happens in plants |
| permeability | amount of sand clay and silt. amount of organic material. compaction of the soil |
| percolation | downward movement of water though soil |
| surface water | water that does not soak in |
| reservoir | objects that store water in nature |