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Across
  1. 3. is the green pigment found in plants
  2. 6. is a chemical element with symbol N and atomic number 7
  3. 7. another word for salt
  4. 8. is the symbol H in the periodic table of elements and atomic number 1
  5. 9. made of, or containing metal
  6. 14. _________ includes all of the living things in a given area, interacting with each other
  7. 15. is a chemical element with the symbol S and atomic number 16
  8. 17. helps in digestion
  9. 18. title of a popular pop song
  10. 19. is a mineral that boosts our immune system
Down
  1. 1. is needed by humans and animals to live
  2. 2. Once taken into the body, ________ are converted to nitrites.
  3. 3. is emitted by plants and trees
  4. 4. is a nonmetallic chemical element with symbol P and atomic number 15
  5. 5. is a chemical element with symbol Ga and atomic number 31
  6. 10. ingredient used in pencils
  7. 11. is a mineral involved in many processes in the body including the building of healthy bones
  8. 12. used in hair straightening and smoothing treatments
  9. 13. is needed to inflate balloons
  10. 16. found in milk and cheese