| A | B |
|---|
| condensation | water vapor turning into liquid when cooled |
| precipitation | water that falls from clouds; rain, snow, sleet, hail |
| runoff | water that runs across the land collecting in streams and rivers |
| percolation | water that seeps through holes in the ground |
| evaporation | liquid water turning to water vapor when heated |
| transpiration | liquid water in organisms turning to water vapor when heated |
| ground water | water stored in natural spaces below the surface of the Earth |
| aquifer | rock layer that stores allows the flow of ground water |
| infiltration | percolation at the point where water and land meet |
| recharge zone | where water enters an acquifer |
| permeability | ability to let water pass through |
| spring | water flows from this when groundwater reaches Earth's surface |
| zone of aeration | underground rock not filled with water |
| zone of saturation | underground rock filled with water |
| porosity | amount of open space |
| water table | upper level of ground where open spaces fill with water |
