noun🔗ShareExpansion des fonds marinsThe outward movement of the seafloor from central underwater ridges as a result of plate tectonics; the major cause of continental drift."Scientists study seafloor spreading to understand how continents move over millions of years. "Les scientifiques étudient l'expansion des fonds marins pour comprendre comment les continents se déplacent sur des millions d'années.geologygeographyoceanenvironmentnaturescienceChat with AIVocabulary GamePractice Reading