environmental chemistry stuff

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Across
  1. 8. toxins becoming more concentrated as they ascend a food chain
  2. 10. a substance with a PH greater than seven
  3. 11. a mixture of plant compounds extracted from lichen
  4. 13. a chemical that kills weeds
  5. 15. a chemical that kills insects
  6. 17. a nutrient that doesn't dissolve in water
Down
  1. 1. a chemical that kills pests
  2. 2. a chemical in food used for energy, growth, and cell repair
  3. 3. a a nutrient that is made of a chain of amino acids
  4. 4. a chemical that kills diseases
  5. 5. a mineral which the body needs less than 100 mg
  6. 6. a molecule that helps enzymes function
  7. 7. a nutrient made of carbon, hydrogen and oxygen
  8. 9. a scale that measures the acidity or alkalinity of a substance
  9. 12. a substance with a PH less than seven
  10. 14. dichlorodiphenyltrichloroethane
  11. 15. a substance than changes colour to indicate whether a substance is acidic or basic
  12. 16. a protein that regulates chemical reactions in the body