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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 convection process pushes the plates, causing them to collide in some places and become separated in others. The separation of two tectonic plates, known as a divergent plate boundary, causes magma to rise to the surface in the gap between the plates. This magma then cools to form new crust, which further pushes the two plates apart.