Barchan dunes along the Pacific coast, Guerrero Negro, Mexico (@ George Steinmetz/Corbis)
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- These dunes are steadily marching toward the nearby city.""The sand\s progress is clear when seen from above
- When persistent winds push on sand banks, the sand can pile up in distinctive crescent-shaped ridges.""Each ridge may be small, like these, or many miles long
- Whales, seals, sea turtles, and birds all flock to a nearby lagoon to reproduce.""Winter is the high season for this oceanic honeymoon suite
- Perhaps you think of sand dunes as silent, static environments.""But they\re dynamic, changing, and ... musical?
