Divergent Boundary
The boundaries between plates that are moving apart are called divergent boundaries. As plates separate, hot molten magma goes up to the Earth's surface to make a new crust. On the ocean floor this separation of plates and production of new crust is called sea-floor spreading. On land, divergent boundaries makes valleys called rifts. In iceland, the divergent boundary between the North American Plate and the Eurasion Plate is visible on land. Sea floor spreading happens along a divergent boundary. The Mid-Atlantic Ridge in the Atlantic Ocean is an example of a divergent boundary.