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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 is about thin oceanic plates knocking against larger continental plates. When both plates are pushed against each other by thermal actions of the underlying magma then the oceanic plates goes under the continental plate.s it is pushed down it melts and forms magma that rises to the surface and the magma pushes its way through the continental plate and creates volcanoes. The more the oceanic plate is pushed under the continental plate, the greater the potential for more volcanoes and more volcanic activity.