Water Pollution

4. These harmful______ _______ are called red, brown, or green tides.
6. These areas bear the brunt of our enormous inputs of pollutants and wastes into the ocean.
7. Commercial harvests of its once-abundant oysters, crabs and fish have fallen sharply because of pollution, overfishing, and disease
9. The key to protecting oceans is to reduce the flow of _____ from the land, streams emptying into the ocean, and the air
11. about 36% of sludge, used to fertilize farmland, forests, golf courses, cemeteries, parkland, and degradable land.
12. Conducted a study that found that the increase of fertilizer use in the Mississipi River Basin have caused an increase in the size of seasonal oxygen depleted zones over the Gulf of Mexico
13. Used in water treatment facilities to kill disease-carrying bacteria and some viruses.
19. ______ organic hydrocarbons in oil immediately kill a number of aquatic organisms.
20. Caused by the poisoning of fish and marine mammals from the explosive growth of toxic microscopic algae.

1. An environmental scientist that calls for the redesigning of sewage treatment systems.
2. A section of the Mississippi river containing 500 hazardous waste sites.
3. _____ and nitrate levels have risen sharply in Chesapeake Bay causing algal blooms and oxygen depletion.
5. The worlds third largest oxygen depleted zone forms off the mouth of this river.
8. This country experienced an outbreak of Cholera that infected more than 300,000 people.
10. Particles of dried sludge that carry viruses and harmful bacteria.
14. a gooey and slimy mixture of bacteria-laden solids and toxic chemicals and metals.
15. this city gets 90% of its water from the Catskill Mountains. The city is known for its water purity and spent $6 billion on its purification system.
16. After the 1989 _____ ______ accident, oil companies promised that their oil tankers would have double hulls.
17. Because of low oxygen levels, these zones contain few oxygen-consuming fish and bottom-dwelling organisms.
18. A zone of clear, oxygen-rich waters promote growth of plankton and sea grasses and support fish.
21. The ___ classified four of five estuaries as threatened or impaired.