We can understand the (1)....... of the earth by considering the pressures beneath the earth's surface Pressure in water is familiar enough a damn must be thicker at the bottom (2) ..... at the top in order to withstand the greater (3) A submarina can descend (= go down) only a few hundred for under the (4).....of the sea. Below that its hull will collapse. These forces are due to the weight of the overlying liquid. This in tumis (5) ….. of the earth's gravitational pull With increasing distance below the surface of the earth pressures quickly (6) ….. enormous. No material can . These presies without flowing in response This means that one part of the earth and project outward very (8)... father than under surrounding regions. The rock beneath the bump would their flow out to the sides until the pressures (9) ..... equalized. Thus (10)...... is what gives the earth a spherical shape and keeps all parts of its she distance from the center.
