Compared to Earth, the Moon is depleted in volatile species like water, sodium and potassium. Simulations suggest that much of the Moon formed from hot, volatile-poor melt in a disk of debris after initially amassing cooler, volatile-rich melt.
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Desch, S. Cooking up the Moon in two steps. Nature Geosci 8, 902–903 (2015). https://doi.org/10.1038/ngeo2597
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DOI: https://doi.org/10.1038/ngeo2597
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