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...Shape of earth evidence the is spherical photographs from space setting sunlight lingers on treetops then hilltops clouds large objects appear disappear over horizon eclipses true an oblate spheroid flattened at poles bulging equator size s structure divided into several layers crust km thick in oceans and beneath continents mantle outer core inner radius lithosphere continuous shell rock around mostly covered by soil loose hydrosphere thin layer water resting covers about surface atmosphere gases held to gravity has thins out as distance increases...