| A | B |
|---|
| surface water | fresh water that is above ground in lakes, ponds, rivers and streams. |
| watershed | the entire area of land that is drained by a river |
| dam | a structure built across a river or stream that prevents most of the water from traveling downstream. |
| groundwater | water that seeps down and is stored underground. |
| aquifers | where large amounts of groundwater may be stored. |
| recharge zones | the area of land from which the grounwater originates. |
| desalinization | the removing of salf from salt water |
| water pollution | the introduction of chemical, physical, or biological material into water taht degrades the quality of the water and affexts the organisms that drink it and live in it. |
| point pollution | pollution that is discharged from a single source, such as a factory, a wastewater treatment plant, or an oil tanker. |
| Nonpoint pollution | pollution that comes from amny sources rather than from a single specific site |
| thermal pollution | the excessive amounts of heat are added to a body of water |
| articicial eutrophication | when inorganic plant nutrients such as phosphorus and nitrogen get into the water from sewage and ferilizer runoff. |
