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inveroment ppt

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89a

  1. 1. <ul><li>Subject: </li></ul><ul><li>carbon cycle </li></ul><ul><li>Prepared by </li></ul><ul><li>Aram I. Abdul-Rahman </li></ul><ul><li>2011-1-27 </li></ul>
  2. 2. <ul><li>The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere , pedosphere , geosphere , hydrosphere , and atmosphere of the Earth. It is one of the most important cycles of the earth and allows for carbon to be recycled and reused throughout the biosphere and all of its organisms. </li></ul><ul><li>The carbon cycle was initially discovered by Joseph Priestley and Antoine Lavoisier </li></ul><ul><li>  </li></ul>
  3. 3. <ul><li>All living organisms contain carbon </li></ul><ul><li>CO 2 is found in all living organisms </li></ul><ul><li>Plants use carbon dioxide and water to form simple sugars (photosynthesis) </li></ul>
  4. 4. <ul><li>Carbon is needed for life </li></ul><ul><li>Carbon dioxide is a greenhouse gas </li></ul><ul><li>Carbon is necessary for life, but carbon dioxide can be harmful </li></ul>
  5. 5. <ul><li>The atmosphere </li></ul><ul><li>Approximately 750 petagrams </li></ul><ul><li>Biosphere </li></ul><ul><li>540- 610 gigatons </li></ul><ul><li>Hydrosphere </li></ul><ul><li>38,00-40,00 metric tons </li></ul>
  6. 6.
  7. 7. <ul><li>Plants take in carbon dioxide and convert it to sugar which can be stored until used for energy. </li></ul><ul><li>This process is called photosynthesis. </li></ul>
  8. 8. <ul><li>CO 2 + H 2 O + sunlight yields O 2 + C 6 H 12 O 6 </li></ul>
  9. 9. <ul><li>Plants release carbon dioxide as a waste product when they convert their stored sugar to chemical energy. </li></ul><ul><li>This process is called respiration. </li></ul>
  10. 10. <ul><li>C 6 H 12 O 6 + O 2 yields CO 2 + H 2 O + energy </li></ul>
  11. 11. <ul><li>Animals eat carbon contained in animal and plant tissues and release carbon dioxide as a waste product. </li></ul><ul><li>This process is respiration . </li></ul>
  12. 12. <ul><li>Decomposers release the carbon from dead plant and animal tissues back into the atmosphere. </li></ul>
  13. 13. <ul><li>Over millions of years fossil fuels may form from the buried remains of plants and animals. </li></ul>
  14. 14. <ul><li>This carbon reenters the atmosphere during combustion . </li></ul>
  15. 15. <ul><li>Dissolved carbon dioxide in sea water becomes deposited as calcium carbonate shells. </li></ul>
  16. 16. <ul><li>Over millions of years, these shells form sedimentary rock. </li></ul>
  17. 17.
  18. 18. <ul><li>Ocean deposits are the biggest sink of carbon on the planet. </li></ul><ul><li>The Rock Cycle ultimately releases carbon stored in sedimentary rock. </li></ul>
  19. 19.
  20. 20. <ul><li>www.2dix.com </li></ul><ul><li>www.google.com </li></ul><ul><li>www.wikpedia.com </li></ul>
  21. 21. <ul><li>And Eventually I hope That You will like it </li></ul><ul><li>And it will be useful for you </li></ul><ul><li>with my respect </li></ul><ul><li>Thanks' 4 all </li></ul>

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