| Term | Definition |
| Freshwater | All the water on the earth |
| Metoeric Water | Water that returns to the ocean |
| Groundwater | Water that soaks into the soil |
| Condensation | Change from vapor to liquid |
| Freezing | Liquid changes to a solid |
| Melting | Solid changes to a liquid |
| Sublimation | Change from solid to a gas |
| Evaporation | Change from liquid to a gas |
| Evapotranspiration | Combination of evaporation and transpiration that occurs in plants |
| Percolation | Downward movement of water through soil |
| reservoir | Objects that store water in nature |
| Ethylene dibromide | (EDB) Mainly a man-made chemical that was used as a pesticide and a gasoline additive |
| Atrazine | A synthetic compound derived from triazine that is widely used as an agricultural herbicide |
| Methemoglobinemia | "Blue Baby Syndrome" |
| Latent Heat of Melting | To change the solid form of a substance in to its liquid form at the same temperature |
| Permeability | Amount of sand, clay, or slit, organic material, and compaction of the soil |
| Pesticides | Kill Bugs |
| Bromacil | A herbicide used to brush control on non cropland areas |
| Dibromochloropropane | Dense yellow organic liquid |
| Surface Water | water contained in places such as lakes, ponds, rivers, streams, and reservoirs |