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quote:Originally posted by gsmollinThe seafloor is relatively young, mostly basalt. It gets subducted under the continents and created at spreading centers, on about a 200 million year cycle. So I don't think a lot of mineral deposits that require a long time to form will be found there, like diamonds. There are certainly some minerals there, and of course petroleum deposits, but many of the continental minerals will probably be found only on the continents.