Isostasy refers to the state of gravitational equilibrium between Earth's lithosphere (outer rigid shell) and the asthenosphere (plastic layer beneath). This concept explains how the Earth's crust "floats" on the denser, semi-fluid mantle below. When weight (like mountains or ice sheets) is added or removed from the crust, it causes it to adjust by rising or sinking until equilibrium is restored. Isostatic adjustments play a crucial role in shaping landscapes, influencing sea levels, and even affecting the Earth's gravitational field. Understanding isostasy is fundamental in geology for interpreting the formation of mountains, the rebound of land after ice ages, and other geological processes that shape our planet's surface.
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