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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.
The movement of the tectonic plates alter the surface of the Earth every single day, even if slowly. Earthquakes, volcanos, mountain building, subduction zones, rift zones, sea floor spreading, lava flows, pyroclastic flows, all are the result of active plate tectonics.