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Sea floor spreading is a fundamental concept in plate tectonics that explains the formation and expansion of oceanic crust at mid-ocean ridges. The mechanism begins with the upwelling of magma from the mantle at divergent plate boundaries, primarily along mid-ocean ridges. As the hot mantle material rises, it partially melts due to decompression, forming ____ _____ ___ __________ _________ __________ ______ ______ __________ ____ ________.
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