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Is there ? assurans svenska Through this melting process, iron metal segregates to the centre of the planetesimal and most of the volatile elements move to the atmosphere. When this chemical differentiation occurs on a small planetesimal, the planetesimal does not have enough gravity to hold on to its atmosphere, so it escapes into space. Earth is very depleted in volatile elements compared to the average composition of the Solar System, likely because it formed from differentiated planetesimals that had already lost their atmospheres.