biology / ecology

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Across
  1. 4. fixation changes nitrogen
  2. 9. water falls to the earth's surface
  3. 10. water vapor changes to liquid water
  4. 11. environment living & nonliving things
  5. 14. water molecules from plants & animals
  6. 15. deeper, larger channels due to rill erosion
Down
  1. 1. transporting rocks to a different place
  2. 2. layer of gases around the earth
  3. 3. liquid water changes to a water vapor
  4. 5. removal of rocks from the original place
  5. 6. converting energy, water CO2 for plants
  6. 7. nonliving things in the area
  7. 8. weather over long periods of time
  8. 12. livingthings in the area
  9. 13. small channels on the side of a slope