#lower_mantle__lowermantle  the deeper part of the mantle
  supertype:  layer  a relatively thin sheetlike expanse or region lying over or under another
  part of:  mantle.layer  the layer of the earth between the crust and the core
     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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