Isostatic compensation describes the equilibrium balance between crustal buoyancy (root) and topographic load; a landmass that is 'overcompensated' has more buoyant support (root) than needed for its current elevation and will be uplifted (isostatic rebound), while an 'undercompensated' landmass has insufficient buoyant support and will subside.
An elevated landmass approaching isostatic equilibrium behaves according to its compensation state: if it is overcompensated (has more buoyant crustal root than needed to support...
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