Myicah

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Across
  1. 2. acids building block for proteins
  2. 5. gasses surrounding earth
  3. 7. made up of living things
  4. 9. nitrogen gas changed to a usable form
  5. 10. carbon dioxide to carbohydrates
  6. 12. most of earths water
  7. 13. bacteria changes nitrogen for use
  8. 15. stored in oceans floor
  9. 16. all living things have it
  10. 17. where water collects
  11. 18. rock layer
  12. 19. changing to water vapor
Down
  1. 1. made up of water
  2. 3. largest reservoir on earth
  3. 4. water vapor turns into liquid
  4. 6. falls to earths surface when clouds are too heavy with liquid
  5. 8. most fresh water on earth is
  6. 11. needed to make DNA, amino acids, and proteins
  7. 14. liquid changes to vapor