Ozone layer

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  • Created by: fatima
  • Created on: 06-05-13 12:54
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  • OZONE
    • BAD
      • troposphere - lowest part of the earth's atmosphere
      • air pollutant - harmful to respiratory system
    • GOOD
      • stratosphere- second layer of earth's atmosphere
      • protects living organisms - prevents harmful ultraviolet light
    • O3 - absorbs harmful UV radiation and converts it into heat
      • UV -b             (280-320)
        • UV -c           (200-280)
          • very harmful - entirely absorbed by ozone
          • breaks 02 molecule
        • UV -a            (320-400)
          • no concern - less energy
        • causes sunburn, genetic damage (most absorbed by ozone)
        • O3 absorbs  UV-b breaking it into 02 and 0
    • FORMATION
      • O2 absorb high energy radiation (<240 nm)
      • Oxygen molecule react with oxygen atom,
        • this process produces heat - absorbed by air molecules hence -STATOSPHERE IS THE WARMEST PART OF ATMOSPHERE
    • mechanism
      • O2 broken down into 2Os
        • O reacts with O2 to form Ozone
          • Ozone broken into O and O2 by UV -b
            • O2 broken down into 2Os
              • O reacts with O2 to form Ozone
                • Ozone broken into O and O2 by UV -b

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