Jessica Carlton
Here are games and activities to help with your knowledge and skills to identify important United States landforms and landmarks.
Over the course of 6 million years, the Grand Canyon has been carved by the Colorado River. One mile (1.6km) deep, 277 miles (433km) long, and up to 18 miles (28.8km)wide, this canyon is like none other. This animated flight is the product of a partnership between NASA, the NPS, and the USGS.
