Across
- 3. harmful chemicals that can be from military activties
- 9. the area in a body of water that has extremely low levels of oxygen
- 10. organisms can die when there is a large change in water temperature
- 12. a pond that is man made and is lined with rubber
- 15. protect crops from harmful organisms
- 16. body of water becomes rich in nutrients
- 19. a non specific area which pollutants are produced
- 20. when bodies of water are contaminated with substances from human activities
- 22. species can indicate when disease are present or not
- 23. layer of the fairly clear water that is found in the middle of the septic tank
- 24. a container that stores wastewater from a house
- 25. act that supports maintaining and restoring biological properties of surface waters
Down
- 1. can be deposited on earth as rain or particles
- 2. contaminates water that passes through lined pipes
- 4. water that is contaminated by human activties such as sewage
- 5. the solid waste that can be found in wastewater
- 6. wastewater goes through series of treatments to clean the water
- 7. the oil spill that occurred in Alaska and spilled millions of liters of oil
- 8. this occurs when there is a change in the water temperatures due to human activities
- 11. the act that sets the standards for safe drinking water
- 13. consists of discarded materials that are not a toxic hazard to humans
- 14. a floating barrier keep the oil contained and control the spread
- 17. the amount of oxygen that is demanded by a quantity of water
- 18. part of the septic system and is the underground popes
- 21. a specific area which pollutants are produced