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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 movements drive the rock cycle by pushing rocks back into the mantle, where they melt and become magma again. Plate movements also cause the folding, faulting, and uplif â¦ t of the crust that move rocks through the rock cycle.