#ozone_hole__ozonehole  an area of the ozone layer (near the poles) that is seasonally depleted of ozone
  supertype:  hole.opening  an opening into or through something
  part of:  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
     part of:  stratosphere  the atmospheric layer between the troposphere and the mesosphere
        part of:  atmosphere.gas  the envelope of gases surrounding any celestial body

No statement uses or specializes ozone_hole; click here to add one.