10) using the following tables: oceanic layers: density (kg/m) layer : seawater 1 030 layer 2: sediment 2,400 layer 3: oceanie lithosphere 2.900 continental layers: layer 2: continental lithosphere 2.700 pn= density of layer n (kg/m) ha = thickness of layer n (m) p = pressure (n/m) g= acceleration of gravity = 9.81 m/s2 thickness (m) 3.600 - 1,000 50,000 70.000 p= g(pihi + pzh2 + + pah) a) calculate the pressure (p) in the mantle beneath the oceans b) calculate the pressure (p) in the mantle beneath the continents c) which has a greater pressure? in terms of isostasy, explain what this means.