Geography
Why Sand Dunes Migrate and Reshape Desert Landscapes
Quick fact
Some sand dunes move at speeds of more than 30 meters per year, and they have been known to bury roads, and even deserts move with them at a surprisingly steady pace.
Why this is interesting
If you watch a desert closely, it seems frozen in the heat—but sand dunes can actually 'walk' across the landscape. Just how do these giants of the desert move over time?