Topics 1-3 Crossword

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