Across
- 6. infectious agent
- 7. eutrophication caused by humans
- 8. pollution the introduction of chemical, physical
- 10. the process of removing dissolved salts
- 11. artificial application of water
- 12. pollution pollution discharged from a single source
- 14. measure of how much of a rock is open space
- 16. pollutants that enter in the ground
- 19. reefs are limestone ridges
Down
- 1. an underground layer of water
- 2. an area in which freshwater mixes
- 3. zone where water moves downward
- 4. pollution when the temperature increases
- 5. successive levels of the food chain
- 6. are a diverse group of organisms
- 9. safe to drink
- 10. barrier constructed to hold back water
- 12. the state or quality of a material
- 13. water water on the surface
- 15. a large natural or artificial lake
- 17. point-source pollution comes from many different sources
- 18. water that contains waste