#ozone_layer__ozonelayer__ozonosphere  a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
  supertype:  #layer  a relatively thin sheetlike expanse or region lying over or under another
  part:  #ozone_hole
  part of:  #stratosphere  the atmospheric layer between the troposphere and the mesosphere
     part of:  #atmosphere.gas  the envelope of gases surrounding any celestial body

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