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... of 1000 km resulted in a volume of (1000*1000*1000*4*??/3) = 4,188,789,330 km3.
The density of iron was 8.37g/cm3, so one cubic meter would be 8.37 tons. One cubic kilometer would then be 8.370,000,000 tons, or about 8.3 billion tons. If we were to take that number and multiply it by the planets volume which was 4,188,789,330, it would result in more or less 3.23 *1016 tons, which according to Lena was a very very big number indeed.
The reason we based our calculations on iron is ...
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