The composition of the atmosphere

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  • The composition of the atmosphere
    • Nitrogen (78%)
      • Used in proteins
    • Oxygen (21%)
      • Used in aerobic respiration
    • Carbon dioxide (0.038%)
      • Used in photosynthesis
    • Methane (0.00017%)
      • Some chemoautotrophs use methane as source of carbon
      • Was important for early life and still important in the deep oceans
    • Ozone (0.000007%)
      • Absorbs UV light in stratosphere
    • Water vapour (Variable, up to 4%)
      • Water in the water cycle distributed in the atmosphere


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