| A | B |
|---|
| pollution | anything that is harmful to the water or the living things that depend on the water |
| pollutant | a substance that causes pollution |
| point source | a known source of pollution can be identified |
| nonpoint source | the exact location of the pollution is not known |
| pesticide | chemicals that kill insects and other organisms |
| water quality | measures the substances in water |
| pH | how acidic or basic a substance is |
| hardness | the combined level of calcium and magnesium in water |
| filtration | the process of passing water through a series of screens so that all of the solid particles are no longer in the water |
| coagulation | particles stick to the flocs |
