Change

Here's a story about an event that is all too common in Earth's history, but, since it works on a different time scale than humans do, we rarely see it. It has implications for evolution (how fast or slow it may happen) and geographic history (does the Earth change in spurts or continuously and gradually). The answer is, of course, both, but this event in Africa is a good example of a "spurt"!

Giant Crack in Africa Will Create a New Ocean
http://www.livescience.com/environment/091102-africa-rift-ocean.html