Mountains and volcanoes are the most common landforms associated with the movement along plate boundaries. Earthquakes also happen at each type of plate boundary.Divergent boundaries occur most often at mid-ocean ridges.As the plates move away from each other a break, or rift, in Earth's crust is created. Magma from the mantle rises up to fill the gap, creating new crust. At an oceanic-continental convergent boundary, subduction of the more dense ocean plate occurs.ivergent boundaries occur most often at mid-ocean ridges. As the plates move away from each other a break, or rift, in Earth's crust is created. Magma from the mantle rises up to fill the gap, creating new crust.