But mountains aren't the only game in town - valleys are where it's at, folks. These low-lying areas can be the result of erosion, where water or ice wears away the rock, or tectonic activity, where the Earth's crust gets all bent out of shape. And, did you know that the Grand Canyon is one of the most famous valleys in the world, with a whopping 277 miles of rocky goodness?
Now, let's not forget about plains - the unsung heroes of the topographic world. These flat areas can be found all over the globe, from the Serengeti to the Great Plains of North America. And, surprisingly, plains can be some of the most geologically active areas on Earth, with all sorts of interesting features like mesas and buttes popping up left and right.
