Biology

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Across
  1. 6. A Layer of the earth
  2. 8. Covers most of the earth and is one of the reasons for life
  3. 9. Composition of Soil
  4. 10. factor affecting soil formation
  5. 11. Another type of biogeochemical cycle
  6. 13. A gas which is found 21% in the atmosphere
  7. 14. The process when CO2 incorporates into plants, product is glucose
  8. 15. Process which takes millions of years and forms fossil fuels
  9. 16. Another factor soil formation
  10. 18. The process in which the dead organism degrades by Microbes and Fungus, CO2 is released
  11. 19. Resources for sustaining life
  12. 20. When water becomes unclean
Down
  1. 1. Direction of the wind during the day
  2. 2. A Layer in the stratosphere
  3. 3. Direction of the wind during the night
  4. 4. A type of biogeochemical cycle
  5. 5. A process in the nitrogen cycle
  6. 7. Process in which glucose is broken into ATP and CO2
  7. 12. Cause of Soil Erosion
  8. 17. Cause of depletion of the soil