#core.midpoint  the central part of the earth
  supertype:  midpoint__center__centre  a point equidistant from the ends of a line or the extremities of a figure
  part of:  lithosphere__geosphere  the solid part of the earth
     part of:  Earth.terrestrial_planet__earth__globe  the 3rd planet from the sun; the planet on which we live; "the Earth moves around the sun"; "he sailed around the world"

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