What are facts about divergent plate boundaries?

They are where mid-ocean ridges occur. Island arcs are common features of convergent boundaries where two ocean plates meet. The boundary where two plates slide past each other, is a transform boundary. The density of the plates, is important at subduction zones, where the denser plate sinks below the less-dense plate, which is also a feature of convergent plates. Tectonic plates are part of the lithosphere, which floats on the asthenosphere.