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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.
Terms describing the processes involved in plate tectonics include: subduction; sea-floor spreading; transform faulting; all of the previous. Zones were subduction occurs are characteristically marked by: island arcs; mountains of volcanic or collision origin; deep trenches; any of the previous