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  1. Oxford American Dictionary

    seafloor spreading

    • IPA[sē flôr ˈsprediNG]
    • n.
      the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.

    • noun: sea-floor spreading

    • 相關詞

    sea-floor spreading

    • n.
      the formation of fresh areas of oceanic crust which occurs through the upwelling of magma at ...

    Oxford Dictionary