1). A mountain range 4 km high is in Airy isostatic equilibrium. Assume crustal and mantle densities of 2.8 g/cm3 and 3.3 g/cm3 respectively.
a) During a period of erosion, a 2 km thickness of material is removed from the mountains. When the new isostatic equilibrium is achieved, how high are the mountains?
b) How high would they be if 10 km of material were eroded away?
c) How much material must be eroded to bring the mountains down to sea level?
