Weathering and erosion eventually breaks the crystals into sand-size grains that are carried away by the prevailing winds from the southwest, forming white dunes.

There's a little bit of sand just about everywhere in Death Valley, but only a few places where enough has piled up to form dunes.

A tsunami may also have flung their washed-away hillsides back ashore, forming dunes that blew over the valley farmland.

These hydrocarbons rain from the sky and collect in vast deposits that form lakes and dunes.

The sand at Dueodde moves easily with the wind to form dunes.

These shells were broken down into lime rich sands which were blown inland to form high mobile dunes.

The plant is important in the sandy beach ecosystem, accumulating sand around itself to form dunes.

The old paint had been blasted off the exterior, leaving deposits of sand inside, where it formed little dunes on the dropcloths at the feet of deranged furniture.

Stacks had toppled here and there, forming dunes.

The higher elevations of the prairie are covered by wind blown sands that form dunes, blowouts, and thin sheets.