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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.
Key points. 1  Subduction is a geological process in which the edge of a lithospheric plate slides underneath the edge of an adjacent plate. 2  Subduction is one of the two major processes of plate tectonics, the other being seafloor spreading.ey points. 1  Subduction is a geological process in which the edge of a lithospheric plate slides underneath the edge of an adjacent plate. 2  Subduction is one of the two major processes of plate tectonics, the other being seafloor spreading.