The answer is D. The density of the lithosphere and asthenosphere
Explanation:
Isostation is a condition of the gravitational balance between the layers of the earth's crust and mantle which causes the crust to "float" over the mantle. The concept of Isostation explains why there are differences in the height of the earth's topography.
According to the concept of isostation that the material of the earth's crust floats because of the balance between the weight of the material and the upward force carried out by the fluid layer.
The existence of an isostatic balance is based on the mass of each unit part of the earth's crust giving equal pressure to subcrustal matter.
