Cycles of Nature

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Across
  1. 3. process where plants use sunlight to make their own sugar (glucose)
  2. 4. returning extra nitrogen into a usable form
  3. 5. when plants absorb water and nutrients from their environment
  4. 8. water vapor changes into liquid water
  5. 9. water falling from the sky
  6. 10. process where water evaporates from plant leaves into atmosphere
  7. 12. makes up about 80% of the earth's atmosphere
  8. 13. become fossil fuels after breaking down
  9. 14. nonrenewable energy sources (coal, oil, natural gas)
  10. 16. oxidation process where bacteria convert ammonia into nitrate
  11. 17. draining of water from an area of land
Down
  1. 1. light from the sun
  2. 2. produced by burning fossil fuels
  3. 3. any type of water released from a cloud on to earth
  4. 6. pollutants released from motor vehicles and industrial facilities
  5. 7. source of nitrogen for living organisms
  6. 11. biodegradable materials from plants or animals
  7. 15. process when liquid turns to gas once it reaches its boiling point