Decoding how sand grains move and accumulate on Earth can also help scientists understand dune formation on Mars.

The photo also focuses on the ripple texture of the desert's sand. "Badain Jaran Desert ... Grefte took this image while in Bonaire, a small island off the coast of Venezuela.

A mysterious grid of dots spanning several miles of Western China's sand dunes ... we can see a man-made texture on the soil, a huge band which seems created by relatively small holes or mounds ...

Photographers have taken incredible pictures this morning of ONE METRE deep snow covering the sand in the small Saharan desert town of Ain Sefra. The town saw a sprinkling of snow just before ...