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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.
Scientists believe that convection currents in the Asthenosphere, due to the Earth s escaping heat, provide the driving force of Plate movement. There are three types of Plate movement Convergence, Divergence, and Transform. Convergence occurs when two plates move towards each other.