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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.
No they are not the same thing.    Plate Tectonics is the study of mechanisms and the results of  large-scale movement of the earth's crust.    Tectonic Plates â¦ are large sections of the earth's crust that float  on top of semi-molten rocks of the upper mantle.