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Dunes

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ADDITIONAL RESOURCES
Simpson Desert PlacemarkLongitudinal Dunes - Seifs, Simpson Desert, Australia - The spectacular longitudinal dunes of the Simpson desert are caused by helicoidal wind flow of the prevailing south-southeastern winds, acting upon ancient alluvial plains.  
White Sands National Monument PlacemarkParabolic Dune, White Sands National Monument - The White Sand National Monument the dunefield is 97 percent gypsum. Vegetation can invert these formations to produce parabolic shapes.  
Guerro Negro Baja Mexico PlacemarkBarchan Dunes, Guerro Negro, Baja Mexico - Barchan ridges in the dune field.  

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