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