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ES 09.2 Groundwater
Terms associated with groundwater.
| Question | Answer |
|---|---|
| water that has penetrated and is stored within Earth's crust | ground water |
| empty spaces between grains in soil or rock that can hold water | pores |
| the amount of pore space within soil or rocks | porosity |
| area within soil and/or rock whose pores are completely filled with groundwater | zone of saturation |
| upper boundary of the zone of saturation | water table |
| area above the water table where soil or rock pores contain only air | zone of aeration |
| ability of a material to let water pass through it | permeability |
| permeable sediment (or rock) with large, interconnected pores that store groundwater | aquifer |
| layer of material (ex: silt, clay, shale) that are barriers to groundwater flow | aquiclude |
| natural discharge of groundwater where Earth's surface intersects an aquifer | spring |
| a natural (and gentle) discharge of groundwater whose temperature exceeds 37 celsius | hot spring |
| a hot spring that discharges water and steam explosively, often regularly | geyser |
| corrosive solution formed from combination of carbon dioxide with water | carbonic acid |
| mineral in limestone dissolved slowly by acidic groundwater | calcite |
| a natural chamber inside Earth formed when limestone dissolves | cave |
| a natural depression on Earth's surface formed when underlying limestone dissolves and the surface collapses | sinkhole |
| a dripstone (cave formation) formed when calcite precipitates from water dripping from the cavern ceiling | stalactite |
| describes water that contains high concentrations of Ca, Mg, Fe, and/or other minerals | hard water |
| hole constructed in the ground to reach below the water table and access groundwater | (ordinary) well |
| localized area around a well where the water table drops due to overpumping | cone of depression |
| process of restoring water removed by a well, often due to precipitation | recharging |
| hole dug into an aquifer under pressure that spurts water like a fountain | artesian well |
| overuse, pollution, chemical runoff, coastal salt, and radon | threats to the water supply |
| largest aquifer in the U.S. (located in midwest) | Ogallala Aquifer |