地ち殻かく均きん衡こうちかくきんこうMeanings1nounisostasygeology›Geological term for the equilibrium between the Earth's crust and mantle. Often explained with the synonym アイソスタシー.See also: アイソスタシー地ち殻かく均きん衡こうの理り論ろんは、山さん脈みゃくの形けい成せいを説せつ明めいするのに使つかわれる。The theory of isostasy is used to explain the formation of mountain ranges.