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  Dynamic Earth 

There are a few major plates, and lots of smaller ones. The plates make up Earth's outer shell, called the lithosphere. Most geological activity stems from the interplay where the plates meet or divide. The movement of the plates create three types of boundaries: the convergent boundary, the divergent boundary, and transform. 

 Divergent is when magma rises and pushes plates apart. - Divergent boundaries are mainly in oceans but sometimes on land. - The Great Rift Valley in Africa is an example of a divergent boundary.  Convergent is when a plate collides with or dives under another. - Convergent boundaries occur under landmass.  Transform is when two plates grind against each other. - The San Andreas Fault is an example of a transform boundary. - Two plates grind past each other along strike-split faults.