Water Pollution

4. Harmful chemicals used for fuel
7. The amount of oxygen that is necessary for one area
9. An indicator for determining if pathogens that could cause disease are present
12. The natural way of extracting oil; America has more of this than any other country
14. The component of a Septic tank made from pipes underground
15. A direct point at which pollution distinctly enters water
16. Harmless organisms inside the human body that act as indicator species
19. A body of water designed to handle large quantities of livestock manure
20. An area with a high demand of oxygen; usually caused by an algae bloom
22. the initiative passed in 1972 to preserve the properties of surface water
25. The rapid change in water temperature that is deadly to organisms

1. Element of the safe drinking act
2. The unhealthy change in water temperature caused by human interference
3. An act passed to set a national standard for drinking water
5. Solid waste
6. The result of human negligence that causes the disturbance of water
8. Acid filtered into Earth by natural occurances such as rain
10. A component of a septic system that recieves waste from a household
11. An increase of fertility in an area of water
13. Industrial compounds responsible for environmental problems that manufacture plastics
17. the event of an area of water having an excess amount of nutrients
18. An area with no direct point polluting water
21. A sewage treatment process involving a septic tank
23. The result of sewage and livestock waste contaminating water
24. relatively clear wastewater found in the septic tank