| Term | Definition |
| Evaporation | The change from water into water vapors |
| Sublimation | The change from solid into gas |
| Deposition | The change from a gas to a solid |
| Dew Point | The temperature where saturation occurs and condensation begins |
| Specific Humidity | The amount of water vapor in the air; expressed by the number of grams per kilogram of air |
| Relative Amount | Comparison between the actual amount of water vapor in the air to the maximum amount |
| Saturated | The condition where the air is holding onto as much water vapor is it possibly could |
| Effect on Salt Water | ? |
| Sleet | Rain drops that freeze before they hit the ground |
| Freezing Rain | Supercooled raindrops that freeze when they hit the ground |
| Rain | Change from water vapor to liquid water, condensation with clouds included |
| Snow | Water vapor that forms when ice particles hit each other and fall when the weight becomes too great |
| Permeability | The rate at which other liquids pass through pors of rock |
| Runoff | Surplus of liquid or rain water that has not been absorbed by soil |
| Water Surplus/ Deficit | Water table that shows how much excess or deficit of water a place has stored in correspondence to an actual average point |
| Porosity | Percent of a material's volume that is pore space |
| Aquifier | A permeable layer of rock and sediment that stores and brings groundwater in enough quantities to supply wells |
| Artesian Formation | An arrangement of permeable rock sandwiched between impermeable rock |
| Geyser | A hot spring that randomly shoots hot water and steam into the air |
| Point-Source Pollution | Pollution that comes from a single identifiable source |
| Non-point-Source Pollution | Pollution that comes from multiple or unidentifiable sources |
| Pore Space | Space between a solid place where liquids can pass through |