Across
- 2. area where fresh water mixes with salt water
- 7. ecological region at the lowest level of a lake or ocean
- 8. the flora and fauna found on the bottom of the sea floor
- 10. water that is safe to drink
- 15. polluted water source with a non-direct source
- 19. removal of salts from seawater
- 21. contaminated water that can be treated
- 22. small organisms drifting or floating in the seawater
Down
- 1. a large lake used for water supply
- 3. aquatic animals that are able to swim and move independently of water currents
- 4. excessive richness of nutrients in a lake
- 5. swamps located on tropical and subtropical zones
- 6. limestone ridges built by tiny coral animals
- 9. chemical, physical, or biological agents into water that degrades the water
- 11. animal and plant matter feces and food waste
- 12. part of the ocean closest to the shore
- 13. run parallel to the shore and protect the mainland
- 14. factory, wasterwater treatment, or a leaking oil tanker
- 16. supports fish, clams, and aquatic birds on shorelines
- 17. the amount of membrane that allows water to pass through
- 18. a bacteria that can cause disease
- 20. land that consists of marches and swamps