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Ground (umbel:SubjectConcept)
solid ground, dry land, land, land surface, land surfaces, terra firma, terrain
Definition
A specialization of GeographicalRegion. Each instance of Ground is a land surface of a PlanetaryBody. Note that an instance of Ground is not necessarily a portion of EarthsTopographicSurface. Any PlanetaryBody with solid ground has an instance of this collection as part of its surface.
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