| A | B |
|---|
| surface water | fresh water that is above ground in lakes, rivers, ponds, and streams |
| groundwater | water that seeps down and is stored underground. |
| aquifers | large amounts of groundwater may be stored in underground rock formations |
| recharge zone | area of land from which the groundwater originates |
| desalination | process in which salt is removed from salt water |
| water pollution | introduction of foreign substances into water that degrade its quality, limit its use, and affect organisms living in it or drinking it. |
| thermal pollution | addition of excessive amounts of heat to a body of water. |
| watershed | entire area of land that is drained by a river |
| dams | a structure built across a river or stream that prevents most of the water from traveling downstream. |
| point pollution | pollution that is discharged from a single source. |
| nonpoint pollution | pollution that comes from many sources rather than from a single specific site. |
| pathogens | disease-causing organisms such as bacteria. |
| bioaccumulation | accumulation of larger and larger amounts of toxin within the tissues of organisms at each successive trophic level. |
| artificial eutrophication | introduction of inorganic plant nutrients into a body of water through a sewage and fertilizer runoff. |
| tap water | better quality of water |
| bottled water | similar to tap water that has been filtered and treated with various chemicals. |
