Isostasy(2) The principle of isostasy governs the rise or subsidence of the crust until mass is buoyantly balanced Because of isostasy, all parts of the lithosphere are in a floating equilibrium a Low-density wood blocks float high and have deep“ roots;” whereas high- densit blocks foat low and have shallow“ roots”Isostasy (2) ◼ The principle of isostasy governs the rise or subsidence of the crust until mass is buoyantly balanced. ◼ Because of isostasy, all parts of the lithosphere are in a floating equilibrium. ◼ Low-density wood blocks float high and have deep “roots,” whereas high-density blocks float low and have shallow “roots