Water Pollution

8. harmless organisms in human intestines
9. increases when there is less oxygen
12. how you would know condition or presence of other organisms or chemicals
15. legislation for safe drinking water
16. the type of water you find in sewers and other non-filtered areas
18. the negative result of high productivity in bodies of water
19. example: a farming region that produces pollution
21. middle of septic tank
24. largest oil spill
25. would be caused by things like building dams

1. sticks to Earth through rain or gas particles
2. someone who lives away from the city would have this system
3. result of chemicals and trash in water
4. not enough oxygen
5. studied in class, parking lot sewage systems with dirt and soil seeping through
6. pinpointed location, easily identified to be producer of pollution
7. a large-scale agricultural operation by humans
10. are produced by factories, for plastics that cannot be recycled
11. human input of nutrients, high productivity result
13. the matter at very bottom of the septic tank
14. where solids go after being flushed and thrown out
17. would be caused by an increase in temperatures from things like global warming
20. what makes up beneath a septic system
22. rockets would use this kind of chemical
23. to support and sustain biological life in water (fish, shellfish, etc)