Isostatic equilibrium in lithosphere requires balancing buoyant force from the asthenosphere and gravity through processes like isostatic uplift and crustal rebound.
Isostatic equilibrium refers to the balance needed for a portion of the lithosphere to float on the asthenosphere, much like a solid floats on a fluid. This balance involves buoyant force from the asthenosphere and gravity acting on the lithosphere. When the lithosphere experiences changes in mass distribution, such as isostatic uplift or crustal rebound, adjustments occur to maintain equilibrium.
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