Buoyancy is the upward force exerted by a fluid that opposes the weight of an object submerged in it. This principle is key in understanding how objects behave in fluids, and it plays a critical role in the concept of isostasy, which describes the balance of Earth's crust floating on the denser mantle. Essentially, buoyancy helps explain how geological structures like mountains and ocean basins maintain equilibrium within the Earth's lithosphere.
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