Answer: The equilibrium between the Earth's crust and the mantle
Notes: Recent studies show that new topological features like plateaus and escarpments form through isostasy. Isostasy is the balance between crustal blocks and the underlying mantle. It represents the equilibrium where land above sea level is supported by the crust below sea level. It is not a process or force but a natural adjustment maintaining gravity by balancing mass. Processes such as ice sheet melting, erosion, sedimentation, and volcanism can disturb isostasy.
