Dead trees in Dead Vlei, Namib-Naukluft Park, Namibia -- Frank Krahmer/Corbis
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- These trees grew here hundreds of years ago, after a very rare flood made the area briefly fertile.""When the area dried up, their skeletons remained
- These trees have been dead for centuries, but it\s so dry here that they don\t decay.""See how this kind of tree looks when it\s alive
- These skeletons of trees share their home with some of the highest sand dunes in the world.""They\re even visible from high in the sky
- When we age, we humans go gray. When these sand dunes age, they go orange. It\s because iron in the sand oxidizes over time.""The older the dune, the brighter the color
