2nd quarter crossword

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Across
  1. 5. The process of burning something
  2. 9. Height of an object
  3. 11. Layer closest to the earth
  4. 14. Absorbing of nutrients
  5. 15. where meteors burn up
Down
  1. 1. This is the layer that has ozone
  2. 2. The process when "Free nitrogen combines with other elements to make usable nitrogen
  3. 3. The process when plants use water sunlight and carbon dioxide to create oxygen and sugar
  4. 4. rot or decompose through the action of bacteria and fungi.
  5. 6. Another name for breathing
  6. 7. Nitrogen that animals and plants can not use
  7. 8. combines nitrogen and oxygen to make it usable
  8. 10. Where the international space station is
  9. 12. anything that absorbs carbon from the atmosphere
  10. 13. gets on the roots of plants and make "free nitrogen" usable