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Explain how isostasy works from a force-balance perspective (i.e., gravitational vs. buoyancy force).

User Mslot
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Isostasy is the balance between the weight of the Earth's crust and the underlying mantle. When crustal material is added, it depresses the underlying mantle, creating an upward force that pushes the crust back up. Similarly, when material is removed, the mantle rebounds and pushes the crust down. This force-balance maintains the equilibrium of the Earth's crust.

User Jonathan Fischoff
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