Water pollution

2. Used water from toilets, showers, baths, kitchen sinks, laundries and industrial processes
4. lakes that are generally very clear, deep, and cold.
5. organism—often a microorganism or a plant—that serves as a measure of the environmental conditions that exist in a given locale.
9. a method used to extract natural gas and oil from deep rock formations known as shale.
12. The curve obtained when the concentration of dissolved oxygen in a river
13. caused by rainfall or snowmelt moving over and through the ground
14. the use of bioremediation and biotransformation methods to harness the naturally occurring ability of microbial xenobiotic metabolism to degrade
15. occurs when human water pollution speeds up the aging process by introducing sewage, detergents, fertilizers, and other nutrient sources into the ecosystem.
16. a situation where of a water body has lost so much of its dissolved oxygen that normal aquatic life begins to die off.

1. rapid growth of algae or cyanobacteria that can cause harm to people, animals, or the local ecology.
3. 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
6. any single identifiable source of pollution from which pollutants are discharged, such as a pipe, ditch, ship or factory smokestack.
7. waste water and excrement conveyed in sewers.
8. areas of water bodies where aquatic life cannot survive because of low oxygen levels.
10. the action of making a liquid more dilute.
11. Small intestinal bacterial overgrowth occurs when there is an abnormal increase in the overall bacterial population in the small intestine