#glacier  a slowly moving mass of ice
  supertype:  #ice_mass  a large mass of ice
  part:  #icefall  #moraine
  substance:  #water_ice.crystal
  subtype:  #Alpine_glacier__Alpine_type_of_glacier  a glacier that moves down from a high valley
  subtype:  #continental_glacier__continentalglacier  a glacier that spreads out from a central mass of ice
     subtype:  #polar_glacier__polarglacier  a glacier near the Arctic or Antarctic poles
  subtype:  #Piedmont_glacier__Piedmont_type_of_glacier  a type of glaciation characteristic of Alaska; large valley glaciers meet to form an almost stagnant sheet of ice
     subtype:  #Great_Mendenhall_Glacier__Mendenhall_Glacier  a glacier of the Piedmont type near Juneau in Alaska

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