I WONDER - What Is Continental Drift?

Alfred Wegener developed the continental drift theory in 1912, explaining how continents formed from Pangaea. The theory suggests that parts of the Earth's crust move slowly on a liquid mantle, forming tectonic plates. This movement, known as continental drift, occurs over millions of years, with the Earth moving about 15 centimeters annually.

How does the Earth's crust move according to the theory?

What is the average movement of the Earth's crust per year as stated in the theory?