| A | B |
|---|
| Aquifer | Large area of rock filled with water |
| Atmospheric water | water vapor, clouds, precipitation |
| Surface water | lakes, rivers, streams, wetlands |
| groundwater | water under the earth's surface |
| freshwater | drinkable water |
| saltwater | seawater, ocean water |
| hydrogeologist | study groundwater |
| water table | water fills every space below |
| unconsolidated | loose sediments |
| Evapotranspiration | evaporation and transpiration |
| pores | empty spaces in rocks |
| permeability | measure of water flow through rocks |
| residence time | time it takes for water to flow through rocks |
| confining layer | layer of low-permeable rock |
| consolidated | solid rock |
| brine | salty groundwater |
| percent of drinkable freshwater on the earth | 0.5 |
| groundwater mining | withdrawing more than is restored |
| pressure | forces groundwater to flow upwards |
| water (hydrologic) cycle | natural recycling of earth's water |
