Wonders of the National Parks: A Geology of North America

Great Dune Fields of North America (1x18)

Air date: Oct 22, 2015

Sand dunes aren't usually pictured in a setting of alpine peaks, but that's precisely the scene at Great Sand Dunes National Park in the Colorado Rockies. Study the conditions that create sprawling dune fields here as well as in Kobuk Valley, White Sands, Death Valley, and Nebraska's Sand Hills.