If you look at a map, the coasts of South America and Africa seem to fit together like puzzle pieces. That's because about 200 million years ago, all the continents on Earth were joined together into one huge supercontinent called Pangaea. Over time, the processes of plate tectonics slowly broke this massive landmass into smaller pieces that spread out to form the continents we know today.

Image credits: main image, Eric Hamilton; Rondi Davies, AMNH.