water pollution

2. poisonous.
6. a synthetic material made from a wide range of organic polymers
7. harmful substance that sometimes spills onto water ways leaving a thick screen over the water
9. bloom occurs when toxin-producing algae grow excessively in a body of water
10. process that improves the quality of water to make it appropriate for a specific
11. water held underground in the soil or in pores and crevices in rock.
13. matter that settles to the bottom of a liquid; dregs.
14. the action of stopping something from happening or arising.

1. the process of adding chlorine to drinking water to kill parasites, bacteria, and viruses.
3. any substance that has a defined composition.
4. A large group of single-cell microorganisms
5. the introduction of harmful materials into the environment
8. water that has been used in the home, in a business, or as part of an industrial process.
9. a body of rock and/or sediment that holds groundwater.
12. the action of making a liquid more dilute.