#Earth's_surface__surface  the outermost level of the land or sea; "earthquakes originate far below the surface"; "three quarters of the Earth's surface is covered by water"
  supertype:  #layer  a relatively thin sheetlike expanse or region lying over or under another
  subtype:  #floor.Earth's_surface  the bottom surface of any a cave or lake etc.
  part of:  #lithosphere
  part:  #body_of_water__water  the part of the earth's surface covered with water (such as a river or lake or ocean); "they invaded our territorial waters"; "they were sitting by the water's edge"
  part:  #opening.space__gap  an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"

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