Chapter 14 Crossword

4. commonly found in rural areas; a small form of sewage treatment
6. fairly clear water found in the middle of a septic tank
8. a large container that receives wastewater from a house
9. a combination of pipes and lawn
11. a common barrier used for cleaning an oil spill
12. low values indicate that water is less polluted by wastewater, high values indicate that water is more polluted by wastewater.
13. the process of water becoming rich in nutrients
14. used for rocket fuel
19. a dramatic change in water temperature; likely to kill organisms
20. rarely found in natural sources of driking water; element
21. a source of pollution that comes from farming regions and suburban communities.
22. handles large quantities of manure produced by livestock
24. found in dog and other animal waste; it helps measure how contaminated sewage is
26. protection and propagation of fish, shellfish, and wildlife and recreation in and on the water

1. occurs in forms of rain or snow or as gases that attach to plants, water, and soil
2. comes from using toilets, bathing, washing clothes and dishes, and livestock
3. helps indicate if there are disease-causing pathogens present
5. when human activities cause substantial change in the temperature of water
7. naturally occuring compound and found dissolved in groundwater; element
10. a source of pollution that comes from factories and treatment plants
15. area of water with extremely low oxygen
16. used to manufacture plastics and insulate electrical transformers
17. sets the national standards for safe drinking water
18. solid waste material from wastewater
23. standard for safe drinking water; established by the EPA
25. heavy metal found in increased amounts of water as a result of human activities; element