exico. Great wav

e-like dunes of gypsum sand have engulfed 275 square miles of desert here and created the largest gypsum dune field in the world. The dunes, brilliant and white, are ever changing. They grow, crest, then slump but always

advance. Slowly but relen

• tlessly th
• e sand, driven by strong so
• uthwest winds, covers everything
• in its path. Within the extr
• emely harsh environment o
• f the dune field, even plan
• Ordnance Testing
• ts and animals adapted to
• desert conditions str
• uggle to survive. Only