| A | B |
|---|
| Tributary | a stream which flows into a larger stream |
| watershed | the land area that supplies water to a river system |
| Divide | a ridge of land that separates one drainage basin from another |
| levee | a long ridge formed by deposits of sediments along side a river channel |
| reservoir | a natural or artificial lake that stores water for human use |
| eutrophocation | the process in which nutrients in a lake build up over time, caudsing an increase in the growth of algae |
| pore | tiny openings in and between soil and rocks that may contain air or water |
| permeable | characteristics of materials such as sand and gravel to allow water to pass easily through them |
| impermeable | opposite of impermeable |
| saturated zone | a layer of permeable rock, thats completely filled with ater |
| water table | the top of saturated zone, or depth to the ground water in |
| unsaturated zone | a layer of rocks above the water table which the pores contain air and water |
| aquifier | an underground layer of rocks that contains soil that holds water |
| spring | a place where ground water flows out of cracks in rocks |
| recharge | new water that enters an aquafier fromt he surface |
| artisan well | a well in which water rises because pressure in the aqufier |
