sea-floor spreading
/S IY1 F L AO0 R S P R EH0 D IH0 NG/noun
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The outward movement of the seafloor from central underwater ridges as a result of plate tectonics; the major cause of continental drift.
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Source: https://en.wiktionary.org/wiki/sea-floor%20spreading, https://en.wiktionary.org/wiki/seafloor%20spreading