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IIIsostasy Defined 18Illustration of Isostasy
pensates Abnormal Density Below 25Shape
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60 miles Airy theory amount area of erosion assume astronomic average elevation blocks cause Cenozoic changes Coast and Geodetic computed continental continents contraction crustal material deflection delta density denudation deposition depth of compensation derived distance dyne earth earth's crust earth's surface eleva erosion and sedimentation expansion extend feet geodesists geodetic data Geodetic Survey geoid geoisotherms geologic gravity anomalies gravity stations greater Hayford hypothesis igneous rocks increase islands isostatic adjustment isostatic anomalies isostatic balance isostatic compensation isostatic equilibrium Joseph Barrell kilometers land areas load lower mean anomaly ments meters mountain system normal occur ocean deeps OOOO planetesimal Pratt pressure principle of isostasy prism probable regard to sign regions result rigidity rock sea-level sedi sedimentary age sedimentary area sediments sinking Special Publication spheroid strata stress differences subcrustal matter temperature terial theory of isostasy thickness tion triangulation U. S. Coast United uplift values of gravity weight writer