Across
- 6. biggest source of oil in the ocean
- 12. when water becomes filled with nutrients by humans
- 13. used for rocket fuel
- 15. hardest source of water to clean
- 16. found lining old pipes
- 19. used to treat sewage in rural areas
- 20. where highest concentrations of arsenic are found
- 22. a pipe from a factory dumping pollution in water is a _______
- 23. part of a sewage treatment plant that removes large debris
- 24. water from sewage is known as _______
Down
- 1. caused by a drastic change in temperature
- 2. sprayed by airplanes
- 3. comes from burning coal
- 4. High BOD can cause a ________
- 5. place in the world with the highest mercury emissions
- 7. low pH can be caused by _______
- 8. a common indicator species
- 9. most common drug or hormone found in streams
- 10. occurs naturally in rocks
- 11. disrupts communication between whales
- 14. what sinks to the bottom of a septic system
- 17. group of industrial compounds known to cause cancer
- 18. causes male fish to develop female characteristics
- 21. used by farmers for livestock waste
- 25. ship that ran aground in Alaska