1. 1 Students type their answers here The Cyahoga river is notable because A. it is polluted with selenium which led to the death of millions of birds. B. it is routinely flooded with untreated sewage from the city of Cleveland. C. it caught fire. D. it is an Endangered Species Act success story. E. it is a living machine cleaning pollution from the local area.

2. 2 Students type their answers here _________ sources of water pollution are relatively easy to monitor and regulate, while _____________ sources of water pollution are difficult to monitor and clean up. A. Domestic; industrial B. Primary; tertiary pollutant C. Nonpoint; point D. Tertiary pollutant; primary E. Point; nonpoint

3. 3 Factories, sewage treatment plants, and oil wells are __________ sources of water pollution. A. Point B. Primary C. Nonpoint D. Tertiary pollutant E. Secondary Students type their answers here

4. 4 Atmospheric deposition of contaminants is an excellent example of A. The properties of water that allow it to disperse contaminants B. Nonpoint pollution C. A point source of pollution D. The relative ease in determining sources of contaminants E. A primary source of pollution Students type their answers here

5. 5 The type of water pollutant that most commonly threatens human health is/are ______. A. Pathogenic organisms B. Dissolved plant matter C. Toxic and hazardous chemicals D. Thermal pollution E. Oxygen-demanding wastes Students type their answers here

6. 6 In the diagram, the horizontal (X) axis should be labeled A. Temperature B. Time C. Distance from outfall pipe D. Depth E. Oxygen content Students type their answers here

7. 7 In the diagram, which of the following organisms would probably be found in the area marked 3 and higher? A. Mayfly and stonefly larvae B. Mosquito larvae C. Bullhead catfish and gar D. Gar, blackfly, and midge larvae E. Leeches and isopods Students type their answers here

8. 8 In the diagram, which of the following organisms would probably be found in the area between 1 and 2? A. Mayfly and stonefly larvae B. Mosquito larvae C. Bullhead catfish and gar D. Gar, blackfly, and midge larvae E. Trout, sludge worms, and mosquito larvae Students type their answers here

9. 9 Cultural eutrophication results from A. Natural sediment and nutrient levels B. A change in animal life as well as plants C. The disappearance of tributary streams D. Human activity E. Natural topography Students type their answers here

10. 10 The sediments that make up the Ganges river delta in India are often toxic because they A. Run through toxic soils B. Originate in coastal industrial areas C. Are highly acidic due to acid rain D. Have concentrations of naturally occurring arsenic E. Dissolve naturally-occurring sulfur dioxide Students type their answers here

11. 11 Acid precipitation is especially disruptive when it occurs in areas with ______________ because of the lack of _____________. A. Limestone in the soil; buffering capacity B. Alkaline soils; acid resistant mosses C. Crystalline bedrock; buffering capacity D. Crystalline bedrock; acid resistant mosses E. Alkaline soils; buffering capacity Students type their answers here

12. 12 Dioxins, pesticides, and polychlorinated biphenyls are all types of A. Inorganic toxic substances B. Heavy metals C. Suspended solids and BODs D. Acidifying agents E. Toxic organic compounds Students type their answers here

13. 13 ______________ is an example of a natural process that is accelerated by human activities. A. Eutrophication B. The weathering and release of toxic inorganic minerals from rocks C. The mobilization and concentration of soluble salts from groundwater D. Sediment loading of rivers E. All of these are correct Students type their answers here

14. 14 Feedlots are a major cause of _________ in water. A. Viruses B. Coliform bacteria C. Nitrates D. Phosphates E. All of these are correct Students type their answers here

15. 15 The following statements explain why contamination of aquifers is dangerous. Which of the statements is false? A. The contaminants are concentrated by the different densities of water in the aquifers. B. Pollutants are extremely stable once they contaminate an aquifer. C. Minuscule amounts of a pollutant can contaminate an entire aquifer. D. Aquifers can take an extremely long time to turn over their water content. E. All of these statements are true. Students type their answers here

16. 16 The potential problem with natural decay for human waste is that A. It never really works B. It only works where population density is low C. It is an expensive process to maintain D. Unlike sewage treatment, it produces toxic by-products E. Natural processes take a long time

17. 17 Primary sewage treatment involves A. Removing solids from water B. Removing all organic matter from water C. Making water transparent again D. Removing all bacteria E. Making water usable for agriculture Students type their answers here

18. 18 The advantage of effluent sewerage is that A. Since solids are removed, pipes and pumps to the central treatment plant can be small and cheap B. Since solids remain in the liquid, disposal is easy and cheap C. Families can do all their processing at home D. Large, expensive municipal systems are no longer needed E. Since solids are digested like a septic system, the effluent can be used as fertilizer

19. 19 Using Bentonite slurries to stabilize liquids in porous substances is an example of A. A containment method of remediation B. Tertiary sewage treatment C. Bioremediation D. Extraction techniques of remediation E. In vitro extraction techniques

20. 20 Using duckweed in a lagoon as low-tech sewage treatment plants is an example of A. A containment method of remediation B. Tertiary sewage treatment C. Bioremediation D. Extraction techniques of remediation E. In vitro extraction techniques Students type their answers here