Question

question: the theory of ___ refers to an equilibrium in buoyancy between the lithosphere and the asthenosphere.
answer input:
spelling counts but capitalization doesnt.

Explanation:

The theory of isostasy is related to the buoyant equilibrium between the lithosphere (the rigid outer layer of the Earth) and the asthenosphere (the more ductile layer beneath it). Isostasy explains how different parts of the lithosphere "float" on the asthenosphere, with adjustments in elevation (like mountain building or subsidence) to maintain this equilibrium.

Answer:

isostasy