A canyon is a deep, narrow valley with steep sides. Here on Earth, canyons are typically formed by long-term erosion from rivers or tectonic activity. But on the moon, where there’s no ...

Formed over thousands of years of erosion caused by hydrothermal activity, water and other natural forces, the Grand Canyon of the Yellowstone is the primary attraction in the Canyon Village area ...

Formed over thousands of years of erosion caused by hydrothermal activity, water and other natural forces, the Grand Canyon of the Yellowstone is the primary attraction in the Canyon Village area ...

LIZ BONNIN: Hi, I'm Liz Bonnin, and I'm digging through the BBC's amazing archives to find out all about physical geography. Now there are a few things you need to know for this next clip.