#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 of:  #stratosphere
  part:  #ozone_hole__ozonehole  an area of the ozone layer (near the poles) that is seasonally depleted of ozone

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