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Relation: subclass

Region1354A topographic location. Regions encompass surfaces of Objects, imaginary places, and Geograph...^
(ExtensionFn Fluid).^
    Atmosphere1Atmosphere is a Mixture of gases surrounding any celestial object that has a gravitational fiel...^
        EarthsAtmosphere.EarthsAtmosphere is the layer of gases, a mixture of mainly oxygen and nitrogen, surrounding Planet...^

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