Explain what might have happened during planetary accretion to cause the Earth to be depleted in light gases. Describe any supporting evidence.

Explaining a Non-chondritic Silicate Earth Table 2.6 (Rollinson, 2007, p. 67) summarizes the differences between the composition of the silicate Earth and chondrites. For each group of elements, the table indicates whether the elements are depleted or enriched (relative to chondrites) in the silicate Earth and briefly indicates the fractionation process that caused the difference. […]

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