Water Pollution

3. a metal that is contaminates water and can damage the brain when digested
4. system used to treat water in rural areas
7. source of dirty water from various sources, like farmland
8. a layer of waste in a septic tank
10. known as forever chemicals, found in plastic
13. stage of water treatment that uses bacteria
14. method of cleaning oil in the ocean by using sponges
15. where soap is put on oil that will clump up the oil to clean it
17. metal that is found in high concentration in rocks
19. law that was passed to set a standard of drinking water in america
20. a form of pollution that affects animals in the ocean, especially whales
22. manmade pond that is lined with rubber to hold manure from livestock
23. the way acid is deposited on earth, in the form of precipitation
24. a big change in water temperature that is harmful for organisms
25. biggest oil spill in the ocean

1. amount of oxygen that is needed by bacteria to decompose
2. heavy metal that humans consume by eating seafood
5. the tanker that spilled oil in Alaska
6. unclean water that's produced by human activities or livestock operations
9. a process where algae blooms in high concentrations and causes oxygen loss in the water
11. a body of water with very low oxygen concentration
12. law that protects bodies of water from pollutants
16. where a body of water is polluted by runoff from pipes
18. tiny pieces of plastic that float around in the ocean
21. a part of the septic system that is made up of pipes underground, to filter water