Rocks are tough, but nature is tougher.

How was the Grand Canyon formed, and what does it tell us about the past?

The formation of a river, from source to sea.

Waterfalls and gorges are some of Earth's most impressive natural features, but how are they formed?

Meanders and oxbow lakes are commonly found in the middle course of a river. What are these features and how are they linked?

Explore the unique features created by flooding at the end of a river's course.