Across
- 3. the runoff produced when water encounters exposed rocks
- 8. a reverse genetic technique that creates mutagenized individuals
- 10. waste from domestic sources
- 15. inhabiting or situated in still fresh water
- 16. inhabiting or situated in rapidly moving water
- 18. collection of principals to apply for farm production
- 20. located below the thermocline where the sunlight does not penetrate
- 22. when water flows over the land as surface water
- 24. a type of wetland fed by mineral rich ground
- 26. a chemical substance which harms water
- 27. system of growing different crops on the same land
- 28. the edge of a watershed
Down
- 1. the science of raising plants
- 2. a type of wetland where water covers the ground
- 4. the cultivation or growth of a single crop
- 5. the process involving loosening and turning of soil in agricultural fields
- 6. the near shore area where sunlight penetrates all the way to the sediment
- 7. the lowest ecological zone in a water body
- 9. water that has infiltrated the ground
- 11. any animal lacking a backbone
- 12. areas where water covers the soil or is present either at or near the surface of the soil all year or for varying periods of time during the year, including during the growing season
- 13. an area of land that drains water into water
- 14. substance used to kill plant or animal life that are pests
- 17. the inability to reproduce
- 19. washing by a stream of water
- 21. pesticides that kill or prevent the growth of fungi
- 23. an area of land permanently saturated
- 25. an agent for killing unwanted plants