The final section of this Geochemical Perspectives article is devoted to unsolved problems. There are, of course, many unsolved problems in geochemistry and related fields, and this section does not pretend to present more than a tiny share of them. The problems that I focus on here are ones that I have worked on myself and for which the answers are still missing or incomplete. I have saved the two biggest ones for last. The origin of life is a fundamental problem that I have worked on only a little but that has drawn the attention of biologists and astrobiologists...
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