This astronaut photograph shows classic large and small sand masses of the central Sahara Desert, where wind is a more powerful land-shaping agent than water.
This photograph taken by an astronaut on the International Space Station highlights a sand dune field within the Burqin-Haba River-Jimunai Desert near the borders of China, Mongolia, Russia, and Kazakhstan.
Captured on June 27, 2009, this true-color image shows part of the White Sands National Monument in New Mexico, where brilliant white gypsum dunes slowly migrate toward the northeast.