Does the earth's land change?
Do the continents move?
Why do earthquakes happen?

These are questions that scientists have tried to answer with the theory of continental drift and plate tectonics. You have probably never heard of this before, but that is why you are here! This Web site will take you through activities, called tasks, that will help you understand this theory and study the history of changes in the earth's surface. As you work through each task, in order, you will be taken to different Web sites to read information, watch video, and play games that show how the earth's forces (earthquakes and glaciers) have changed the earth's surface over millions of years. Finally, you will work in a group to present what you learn to your class. If you are ready for the challenge, go ahead and get started!