Across
- 5. standard for safe drinking water
- 9. a dramatic change in water temperature
- 11. sewege treatment system used for rural homes
- 12. incesticide banned in 1972 for harmful effects on animals
- 13. water produced and contaminated by human activities
- 15. a ___ zone is an area with low oxygen concentration
- 17. undergound septic pipes below the surface
- 19. type of species indicating if pathogens are present
- 20. in eutrophication,body of water becomes rich in
- 21. a diffused area that produces pollution
- 23. non-chemical water pollution from humans
- 25. human-made pond to handle animal waste
- 26. Acids deposited on Earth as rain and snow or gases and particles
Down
- 1. bacteria in human intestines that serve as an indicator species
- 2. harmful chemicals used for rocket fuel
- 3. wildlife in the water
- 4. distinct location where pollution is produced
- 6. a heavy metal found in water
- 7. the layer of fairly clear water in a septic tank
- 8. supports the protection of fish,
- 10. water is contaminated passing through these pipes
- 14. increase in the fertility of water
- 16. chemicals that control pest organisms
- 18. solid waste material
- 22. a group of industrial compounds used to make plastics
- 24. found in Earth's crust, can dissolve into groundwater