Given the density of iron as 7800 kg/m 3, and the Earth radius is 6.38 x 10 6 m, if 55% of the Earth's volume is filled with Iron, and 45% is filled with rocks that has a density of 2600 kg/m 3, what is the total mass of the Earth? I am looking for the total mass. m-densityxvolume, but am confused as im not such if i take 55% of irons density and 45% of the rocks density?
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