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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 process called plate tectonics is responsible for plates pulling apart. Over time, and with the combination of carbon dioxide, erosion, and force, plates are able to pull â¦apart. This will eventually cause some plates to separate from one another.