seafloor spreading

noun

Definition of seafloor spreading 

: the divergence at mid-ocean ridges of the tectonic plates underlying the oceans that is due to upwelling from the earth's interior of magma which solidifies and adds to the spreading plates

First Known Use of seafloor spreading

1969, in the meaning defined above

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sea flea

seafloor

seafloor spreading

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sea-foam

seafoam

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The first known use of seafloor spreading was in 1969

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