Running along the top of this chain of mountains is a deep crack, called a rift valley. It is here that new ocean floor is continuously created. As the two sides of the mountain move away from ...

The shallow waters of the rift valley can be ideal environments for limestones to form. Here is a nice summary of sedimentation on divergent margins: be sure to look at the diagrams on the right side ...

At divergent boundaries in the oceans ... On land, giant troughs such as the Great Rift Valley in Africa form where plates are tugged apart. If the plates there continue to diverge, millions ...