Across
- 3. oxygen combines with other elements to from new substances
- 5. chemical used to control molds and fungi
- 8. chemical used to control pests
- 11. any substance used to fertilize the soil
- 12. fertilizer consisting of potassium nitrate or sodium nitrate
- 13. pH value of more than 7
- 14. speeds up a chemical reaction
- 17. protein molecule in living organisms
- 18. natural process or in return for cultivation
Down
- 1. providing nourishment
- 2. invertebrate of the phylum Arthropods
- 4. discharging
- 6. chemical used to control insects
- 7. something annoying or troublesome
- 9. unnatural or simulated
- 10. chemical used to control weeds
- 15. mixture of plant compounds used as a chemical indicator
- 16. pH value of less than 7