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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.
What is the theory of plate tectonics? The Earth's crust is divided into huge plates that move and interact with each other due to convection currents in the mantle The theory of plate tectonics explains the formation, movement, and subduction of Earth's plates.