| A | B |
|---|
| aquifer | layers of rock that store water |
| porosity | measure of the number of spaces or openings in rocks or sediments |
| aquitard | underground layer of impermeable rock |
| permeability | allows liquids to pass through; determined by how well pores are connected |
| well | man-made hole in the ground that reaches below the water table |
| artesian well | does not require a pump, water flow naturally to the surface due to pressure |
| spring | water that bubbles from the ground where the surface of the land dips below the water table. |
| lake | forms when the water table rises above Earth's surface |
| geyser | a type of hot spring that bursts out of the ground due to pressure. |
| recharge zone | area where precipitation infiltrates the ground |
| cave | underground opening formed due to erosion by groundwater |
| sinkhole | circular depression formed when the roof of a cave collapses |
| zone of aeration | area below the surface that contains air, but not water |
| zone of saturation | area below the surface that is filled with water |
| water table | surface of water in zone of saturation |
| groundwater | water beneath Earth's surface |
