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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.
How does the movement of tectonic plates occur? The layer of the Earth called the mantle is continuously circulating like rice would in boiling water. This movement under the crust cause the plates to shift moving the plate â¦ s to create mountains, valleys, earthquakes, and tsunamis..