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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. In a nutshell, the basics of plate tectonics are these: 1) the Earth's crust consists of a number of rigid plates. 2) these plates move and interact with each other. 3) the driving force behind plate tectonics is convection in the mantle. 4) in areas of mantle upwelling (rising hot mantle material) the crust is stretched apart and new crust is generated.