Geography
The Theory of Plate Tectonics and Continental Drift
Quick fact
Most earthquakes and volcanoes are concentrated in narrow belts that trace the edges of about a dozen tectonic plates, which move at speeds comparable to the growth of your fingernails—about 2 to 10 centimeters per year.
Why this is interesting
You’ve probably seen how South America and Africa look like they could fit together like puzzle pieces. But what if they actually did fit together—300 million years ago?