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  1. seafloor spreading

    • IPA[sē flô(ə)r 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
    • n.
      the formation of fresh areas of oceanic crust which occurs through the upwelling of magma at ...

    Oxford Dictionary