Chapter 14

5. a species that tells whether a disease is present or not
6. amount of oxygen a quantity of water uses
9. can kill organisms due to a great change in water temperature
11. when water is dirty
12. serve as an indicator species and are harmless microorganisms
14. poned built to contain large amounts of manure from livestock
17. when water becomes too rich in nutrients
18. small system that treats sewage for areas with few homes
20. fairly clean water that contains large amounts of bacteria, pathogens, and inorganic nutrients
21. the combination of underground pipes in a septic system
22. acids that settle on earth as rain, snow or gasses and practical and attach to land
23. water that comes from sewage
24. produces pollution like storm runoff
25. when industries remove cold water from ocean and replace it with warm water

1. something heavier than water sinks to the bottom of a tank and forms ____
2. a distinct area where pollution is produced
3. when soil particles are carried downstream
4. treats sewage in a container at a house
7. very little life because of low levels of oxygen
8. standards for safe drinking water
10. due to human activities there is an increase in fertility in water
13. cause many environmental problems and are compounds used to manufacture plastics and insulate electrical transformers
15. a legislation that protects, helps, maintains, and restores clean water
16. used for rocket fuel and are harmful chemicals
19. a legislation that sets national standards for safe and healthy drinking water