| A | B |
|---|
| Aquifer | An underground layer of rock or soil that holds water. |
| GROUNDWATER | Water that fills the cracks and pores in underground soil and rock layers. |
| WATER CYCLE | The continuous process by which water moves from Earth's surface to the atmosphere and back, passing through the living and nonliving parts of the environment. |
| Infiltration | Process by which precipitation enters the ground. |
| Permeability | Ability of a material to let water pass. |
| Porosity | Percentage of openm spaces between grains in a rock. |
| Water Table | Upper boundary of the zone of saturation. |
| Zone of Saturation | Depth below Earth's surface where all pores of a material are completly filled with groundwater. |
| Cave | Underground opening connected to Earth's surface. |
| Karst Topography | Region with sinkholes caused by groundwater dissolution of limestone. |
| WATERSHED | The land area that supplies water to a river system. |
| Sinkhole | Depression formed when a cave collapses. |
| Stalactite | Cone-shaped deposit the forms on a cave's ceiling. |
| RESERVOIR | A natural of artificial lake that stores water for human use. |
| EUTROPHICATION | The process by which nutrients in a lake build up over time, causing an increase in the growth of algae. |
| Stalagmite | Cone-shaped deposit the forms on a cave's floor. |
| Travertine | A type of limestone found in dripstone formations. |
| Artesian Well | A place where groundwater bubbles or flows out of cracks in the rocks |
| SATURATED ZONE | A layer of permeable rock or soil in which the cracks and pores are completely filled with water. |
| WATER TABLE | The top of the saturated zone, or depth to the groundwater in an aquifer. |
| UNSATURATED ZONE | A layer of rock and soil above the water table in which the pores contain air as well as water. |
| Drawdown | Difference in water level in a pumped well and the original level. |
| Geyser | Explosive hot spring that erupts regularly. |
| RECHARGE | New water that enters an aquifer from the surface. |
| Hot Spring | Thermal spring with temperatures higher than the human body. |
| Well | Deep hole drilled or dug into the ground to reach a reservoir of groundwater. |
