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. The size of an Amoeba is 150 ,um. Express this length in nm and 121. . Find the surface area of Earth in km2 if the diameter of the Earth is 12740 km. If the surface area of the Moon is 3.7915 x 107 km2, nd the Moon's radius and compare it with the radius of the Earth. . The size of the Hatom is 1 121. Assume the Hatom is spherical; calculate its volume in m3. . The distance to the Earth's closest star, the Alpha Centauri binary star system, is 1.339 pc. Calculate this distance in Ly. and in km. . The radius of a proton is 1 fm. Calculate its volume in fms and in 243 . Compare the volume of the proton to that of the H-atom in problem 3