Running along the top of this chain of mountains is a deep crack, called a rift valley. It is here that ... At the East Pacific rise, which is pushing a plate into the west coast of South America ...

The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent ... troughs such as the Great Rift Valley in Africa form where ...

Different plate ... rift valley may fill with fresh water and become a lake. As the rift opens, ocean water may invade. The shallow waters of the rift valley can be ideal environments for limestones ...

At divergent boundaries, plates move away from each other and form mid-ocean ridges or major rift zones, and at strike-slip boundaries plates slide past each other. But none of these plate ...