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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.
Plate Tectonics. Plate tectonics is the theory explaining the motion of the outer crust or the lithosphere of earth. Lithosphere is divided into tectonics plates. Two main types of tectonics plates are the oceanic crust and continental crust.Oceanic crust is mainly composed of Silicon and magnesium, hence called SIMA.ontinental Drift vs Plate Tectonics. Continental drift and plate tectonics are two theories explaining the geological evolution of the earth, specifically its crust. Continental Drift. Continental drift is a theory first presented by Abraham Ortelius (Abraham Ortels) in 1596.