DIVERGENT BOUNDARY A weak zone in the lithosphere occurs, and magma from the mantle begins to rise up and force the plate to crack into two pieces Divergent margins are almost always found along the mid-ocean ridges under water We call this process seafloor spreading Seafloor spreading will produce new ocean crust as the two separating plates pull apart and the asthenosphere wells up New crust is formed at divergent margins Seafloor spreading causes the plate to increase in size
