|
 Floc | dirt that clumps together after a chemical is added |
| Sedimentation | flocs fall to the bottom |
| Macroinvertebrate | organism that can be used to indicate water quality |
| Anthropogenic | Caused by humans |
| Watershed | area that drains into a body of water such as a river |
| Point | pollution that comes from one specific location |
| Non-point | pollution that comes from many locations |
| Reclaimed water | water that is treated and is then reused |
| Primary treatment | water that is passed through screens and filters to remove pollutants |
| Secondary treatment | water is passed through filters and then bacteria and other microbes are used to remove other pollutants |
| Coagulation | stage in the water treatment process when chemicals such as alum or ferric chloride are added |
| Chlorine | chemical that kills bacteria |
| Disinfection | chlorine is added |
| Fishing | causes a reduction in the gene pool of fish |
| Dams | stops the migration of fish |
| Agriculture | adds bacteria, fertilizer, pesticides, and can raise water temperature |
| Fire | can dry up soil, destroy vegetation, release nutrients back into the soil and can cause new trees to grow |
| Volcanic activity | creates new land and can change the flow of water |
| Boats | kill organisms, cause oil spills, waves cause erosion, and add pollutants to water |
| Mining | water picks up sediments and can change the pH of water |
| Acid rain | caused by emissions; lowers the pH of water |
| Flooding | too much water may transport organisms to new habitats |
| Sedimentation | Soil and other materials fall to the bottom; can clog gills of fish |