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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.
Originally Answered: Why and how do tectonic plates move? The driving force is Convection, or a process by which a fluid will circulate if it is heated from one side and not the other. The mantle is under enough pressure that a significant portion of it is quite plastic, and enough of it is hot enough that it is quite fluid. Source: Plate Tectonics : How Plates Move. Here's a map of the plates' movements: Seems decently consistent with how a surface might be moved by convection currents.