isostasy

Equilibrium in the earth’s crust such that the forces tending to elevate landmasses balance the forces tending to depress landmasses.

In physical, balance or equilibrium; the property of attaining a condition of stable equilibrium when under the action of permanent stress.

The state or quality of being isostatic.

The state of balance or pressure equilibrium thought to exist within the Earth‘s crust, whereby the upper lithosphere floats on denser magma beneath.

(geology) a general equilibrium of the forces tending to elevate or depress the earth’s crust