water-pollution

9. removal of a portion of the suspended solids and organic matter from the sewage
10. waste water and excrement conveyed in sewers.
12. substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
14. deviation from the natural temperature in a habitat and can range from elevated temperatures associated with industrial cooling activities to discharges of cold water into streams below large impoundments.
15. a chemical or natural substance added to soil or land to increase its fertility.

1. broad, diffuse areas, difficult to identify, expensive to clean up, hard to control
2. any single identifiable source of pollution from which pollutants are discharged, such as a pipe, ditch, ship or factory smokestack.”
3. occurs when human water pollution speeds up the aging process by introducing sewage, detergents, fertilizers, and other nutrient sources into the ecosystem.
4. the single most common source of pollution in U.S. waters
5. a rapid growth of microscopic algae or cyanobacteria in water, often resulting in a colored scum on the surface.
6. removes about 85 percent of the organic matter in sewage by making use of the bacteria in it.
7. a member of a large group of unicellular microorganisms which have cell walls but lack organelles
8. change in water quality that can harm organisms or make water unfit for human use
11. an area of the ocean that is depleted of oxygen, frequently due to pollution
13. excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.