Isotope geochemistry. The origin of water on earth.
Robert
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D055580:Astronomical Phenomena; D001256:Astronomy; D001272:Atmosphere; D003903:Deuterium; D018534:Earth, Planet; D019419:Evolution, Planetary; D006859:Hydrogen; D018535:Mars; D019110:Meteoroids; D017640:Silicates / Q000737:chemistry; D014867:Water
D017640:Silicates; D014867:Water; D006859:Hydrogen; D003903:Deuterium