| http://www.w3.org/ns/prov#value | - ???Geochemical measurements have revealed a surface poor in iron, but rich in moderately volatile elements such as sulfur and sodium,??? said Nittler. ???These results rule out some long-standing theories put forward to explain Mercury???s anomalously high density compared with the other planets in the inner solar system,??? he explained. ???Maps of elemental abundances show that the interior is h
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