According to Wegner's theory, there was only one large continent 300 million years ago. He named this continent Pangaea (from the Greek for "all the Earth," and pronounced "pan-GEE-uh"). Pangaea then split, and its pieces drifted, or moved, apart over millions of years to form today's continents. In fact, the continents are still drifting today. This video shows Wegener's evidence and explains the difficulty he had getting his ideas across to geologists—scientists who study the history and structure of Earth. Click "View" on the left to watch the video.

Now show what you have learned so far about continental drift by answering these four questions.