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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 tectonics and the carbon cycle are intertwined in several different ways. In many respects, it is plate tectonics that spurs on the recycling of carbon atoms.Convergent boundaries affect the carbon cycle in two ways: through subduction and eruption. 1  Subduction is the process by which continental crust slides beneath another portion of crust.2  The subducting crust melts and becomes magma, the material that fuels volcanic eruption. The melted crust convecting through the mantle will eventually resurface in the form of lava during eruptions from volcanoes. 2  These volcanoes were originally formed by tectonic forces--where there is an excess of magma below the crust due to subduction, it is forced to erupt. 3  The process of eruption includes degassing.