We can understand the (1)... of the earth by considering the pressures beneath the earth's surface. Pressure in water is familiar enough a dam must be thicker at the bottom (2)... at the top in order to withstand the greater (3) ... a submatino can descend go dowonly a few hundred feet under the (4) of the sel. Below that its hull will collapse These forces are due to the weight of the overlying liquid, This in turn is a (5)... of the earth's gravitational pull With increasing distance below the surface of the earth pressures quickly (6)... enormous. No material can (7). These pressures without flowing in response Thus thens that one part of the earth cut project outward very (8)... father thunder Stounding regions. The rock beneath the bump would the flow out to the sides until the pressures (9)., equulized. Thus (10)... is what gives the earth is spherical shape. keeps all puts of its surface distance from the center