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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.
How does the movement of tectonic plates contribute to the rock cycle? The forces that move tectonic plates push deep rocks up to Earth's surface, and also push rocks at Earth's surface down to great depths. Tectonic plate motion may also lead to volcanic activity. What role do heat and pressure play in the rock cycle?