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Chapter 5: The Biogeochemical Cycles

Chapter 5: The Biogeochemical Cycles

Chapter 5: The Biogeochemical Cycles

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<strong>The</strong> Carbon Cycle<br />

• Carbon enters the biota through<br />

photosynthesis and is returned by<br />

respiration or fire.<br />

– When organisms die, decomposition releases<br />

carbon as CO 2 or Methane (CH 4 ).<br />

– Under certain conditions carbon is not be<br />

released<br />

• Transformed into fossil fuels<br />

• Deposition as marine sediments CaCO 3

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