A simple model (Fig. 10$-$56) considers a continent as a block (density $\approx$ 2800 kg$/m^3$) floating in the mantle rock around it (density $\approx$ 3300 kg$/m^3$). Assuming the continent
is 35 km thick (the average thickness of the Earth's continental crust), estimate the height of the continent above the surrounding mantle rock.