#ice  the frozen part of a body of water
  supertype:  #physical_object__object  a tangible and visible entity; an entity that can cast a shadow; "it was full of rackets, balls and other objects"
  subtype:  #drift_ice__driftice  masses of ice floating in the open sea
  subtype:  #icefall  a steep part of a glacier resembling a frozen waterfall
  subtype:  #pack_ice__Ice_pack  a large expanse of floating ice
  subtype:  #shelf_ice__shelfice__ice_shelf__iceshelf  ice that is attached to land but projects out to sea

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