| A | B |
|---|
| watershed | land that drains water into a stream or lake |
| macroinvertebrate | aquatic insect form visible with the naked eye |
| riparian zone | area of the stream bank up to the high water mark |
| pH | level of acidity or hydrogen ions in water |
| dissolved oxygen | gas that is needed by all aquatic animals |
| aquatic | growing or living in water |
| turbidity | how cloudy or murky water is |
| fecal coliform | bacteria found in animal waste and untreated human sewage |
| pollution | things that dirty or harm the environment |
| acid rain | sulfur or nitrogen gases combined with water in the atmosphere |
| erosion | wearing away of soil or rock over time |
| abiotic | all non-living things in an area |
| biotic | all living (or once living) things in an area |
| tolerance | level of pollution that an organism can stand |
| high phosphate levels | indication of fertilizer pollution |
| low pH | indication of acid pollution in unbuffered waters |
| high turbidity levels | indicates sediment from farms or construction sites |
| many sensitive macroinvertebrates | indication of clean, unpolluted water |
