Divergent boundaries cause mid oceanic ridges. Some other common characteristics are high heat flow, mild volcanic activity, and shallow earthquakes. The second boundary is called convergent and this is a compression, or a stress that can shorten or compresses the plates. Convergent boundaries cause mountain ranges to develop. The Himalayas were formed when the plate carrying India collided with the plate carrying Eurasia.
Strong earthquakes are very common with convergent boundaries as well.
The third type of boundary is a transform boundary and this is when the plates slide past each other along faults causing mid-oceanic ridges and trenches. One plate may be forced down into the mantle under the other plate. When this occurs, a deep oceans trench forms. The largest ocean form is the Mariana Trench in the Pacific Ocean southwest of Guam. Another example is the San Andreas Fault with is between the North American plate and the Pacific plate.