Geography
Understanding Tectonic Plate Theory and Continental Drift Mechanics
Quick fact
Earth's continents move about as fast as your fingernails grow—roughly 1 to 10 centimeters per year—yet over millions of years, this leads to full continental drift and even pushed the Himalayas to their height.
Why this is interesting
Have you ever noticed that the coast of South America seems to fit like a puzzle piece into Africa? What if the continents weren't always where they are today?