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1 Seafloor spreading is one of the two major processes of plate tectonics, the other being subduction. 2  Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor. Seafloor spreading is one of the two major processes of plate tectonics, the other being subduction. 2  Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor.
Together, the crust and upper portion of the mantle â called the lithosphere â are where most important geological processes occur, such as mountain-building, earthquakes and the source of volcanoes. The slow churning and overturning of the mantle is what drives the movements of Earth's tectonic plates.