| A | B |
|---|
| water quality | measurement of the substances in water besides water molecules |
| pH | measurement of how acidic or basic a substance is |
| hardness | levels of the minerals - calcium and magnesium - in water |
| concentration | amount of one substance in a certain volume of another substance |
| filtration | process of passing water through a series of screens to remove large solid particles |
| flocs | sticky globs |
| coagulation | process where particles in water stick to flocs |
| sewage | water containing human waste |
| sludge | deposits of fine solids that settle out from wastewater during the treatment process |
| point source | a specific source of pollution that can be identified , such as a pipe |
| nonpoint source | a widely spread source of pollution that is difficult to link to a specific point of origin, such as road runoff |
| acid rain | rain that is more acidic than normal |
| pesticide | a chemical intended to kill insects and other organisms that damage crops |
| water pollution | the addition of any substance that has a negative effect on water or the living things that depend on the water |
