seafloor spreading

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Noun[edit]

seafloor spreading (uncountable)

  1. (geology) The outward movement of the seafloor from central underwater ridges as a result of plate tectonics; the major cause of continental drift.
    • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 143:
      However, the recognition of sea-floor spreading made sense of continental splitting without having to invoke earth expansion.

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