| A | B |
|---|
| surface water | fresh water on earth's surface |
| river system | when streams & rivers form a flowing network |
| watershed | the area of land that is drained by a river |
| groundwater | water stored beneath the Earth's surface |
| aquifer | an underground formation that contains groundwater |
| porosity | the amount of space between the particles of a rock |
| permeability | the ability of rock or soil to allow water to flow |
| recharge zone | the area of Earth's surface where water runs into the aquifer |
| potable | water that is safe to drink |
| pathogen | organisms that cause illness or disease |
| irrigation | a method of providing plants with water |
| dam | a structure built across a river to control the river's flow |
| reservoir | when a river is dammed, an artificial lake |
| Desalination | the process of removing salt from salt water |
| water pollution | chemical, physical, or biological agents degrading water quality |
| point-source pollution | pollution discharged from a single source |
| nonpoint-source pollution | an unregulated form of pollution that is usually run off |
| wastewater | water that contains waste from homes or industry |
| artificial eutrophication | Eutrophication caused by humans |
| thermal pollution | when the temperature of a body of water increases |
| biomagnification | accumulation of pollutants at successive levels of the food chain |
