Topics 1-3 Crossword

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