Which will most likely form when movement along a plate boundary forces landmass to be pulled apart?

When movement along a plate boundary causes landmasses to be pulled apart, a rift valley is most likely to form. This occurs as the tectonic plates diverge, leading to the subsidence of the land between them. The resulting geological features often include steep cliffs and volcanic activity due to the upward movement of magma. Examples of such formations can be seen in the East African Rift.