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Sea floor spreading is a fundamental process in plate tectonics that explains the formation of new oceanic crust at mid-ocean ridges. It occurs when tectonic plates diverge, allowing magma from the mantle to rise through the gap. As the magma cools and solidifies, it forms new basaltic crust, which gradually ___ __________ __________ _______ ___ ________ ______ ___ _______ ________.
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