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seafloor spreading

a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for seafloor spreading
  • Sea level change due to oscillations in seafloor spreading rate.
  • Finally, volcanos sometimes form in the middle of the ocean, above seafloor spreading centers.

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