Water Pollution

2. Areas of water that cannot sustain life because of low oxygen levels.
5. Oil as it comes out of the ground.
6. An unproductive lake with clear water.
7. When human water pollution speeds up eutrophication.
8. A physical and mechanical process.
10. A chemical process
11. A technique used to enable the extraction of gas or oil from underground.
13. A rapid growth of microscopic algae in water.
14. A lake with high levels of biological productivity.
15. Water from domestic sources such as bathing, toilet flushing, and dishwashing.

1. The reduction in dissolved oxygen plotted over a distance along a body of water.
3. A biological process
4. Bleaching to remove discoloration and kill off most bacteria.
9. Excessive richness of nutrients in a lake or other body of water.
12. The act of making a liquid more dilute.