A)SubductionB)ConvectionC)RidgingD)Sea- Floor Spreading**Please and Thank you?
D) Sea-Floor Spreading Choices A, B, and C do have to do with oceanic spreading, but are not the direct manner in which the new seafloor is formed. Sea-floor spreading is the volcanic activity at oceanic ridges that actually creates new seafloor.
D- sea-floor spreadin caused by Mid-Oceanic ridges also known as divergent plate boundary where two plates are spreading apart and in the middle a rift valley is formed marked as the boundary between the spreadind. at the edges of the rift valley magma rises up to the surface and cools forming new sea floor.
