#ice_mass  a large mass of ice
  supertype:  #geological_formation__geology  the geological features of the earth
  subtype:  #glacier  a slowly moving mass of ice
     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
  subtype:  #iceberg__berg  a large mass of ice floating at sea; usually broken off of a polar glacier
     subtype:  #growler  a small iceberg or ice floe just large enough to be hazardous for shipping
  subtype:  #icecap__ice_cap__icecap  a mass of ice and snow that permanently covers a large area of land (e.g., the polar regions or a mountain peak)
  subtype:  #ice_field__icefield  a large flat mass of ice (larger than an ice floe) floating at sea
  subtype:  #ice_floe__icefloe__floe  a flat mass of ice (smaller than an ice field) floating at sea

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