ScienceDaily (Apr. 29, 2008) — Chondritic meteorites have a similar chemical composition to the sun and are therefore reliable witnesses as to what the solar nebula, from which the planets formed, was composed of. This can be used to deduce what the Earth consists of chemically. However, ETH Zurich researchers have now discovered that strictly speaking this fundamental geological assumption is not true.
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http://www.sciencedaily.com/releases/2008/04/080428081732.htm
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