Water Pollution

6. organisms that are too small to be seen without using a microscope
9. a covered, porous-walled chamber that allows water to slowly soak into the ground
10. any discernable, confined and discrete channel by which pollutants can be discharged
11. process of sampling, measurement and subsequent recording
12. any metallic chemical element that has a relatively high density and is toxic or poisonous at low concentration
13. waste water and excrement conveyed in sewers
14. the natural world, as a whole or in a particular geographical area, especially as affected by human activity

1. The introduction by man of substances or energy to the environment resulting in harmful effects
2. a substance that is produced or used in a process (reaction) involving changes to atoms or molecules
3. an acute diarrheal illness caused by infection of the intestine with Vibrio cholerae bacteria
4. any matter that settles to the bottom of a liquid
5. the degree to which a chemical substance or a particular mixture of substances can damage an organism.
7. a biological community of interacting organisms and their physical environment.
8. the draining away of water (or substances carried in it) from the surface of an area of land, a building or structure
9. a place, person, or thing from which something originates or can be obtained