Answer:Seafloor spreading is caused by diverging plates.
Explanation:Seafloor spreading is a process during which tectonic plates (large irregularly shaped slabs of solid rock that's usually made of both continental and oceanic lithosphere) move and separate aside from one another. Seafloor spreading is a process that happens at mid-ocean ridges, where new oceanic crust is created through volcanic activity and so gradually moves off from the ridge.