You're looking at White Sands National Park from space.
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Gypsum sand is extremely rare, and gypsum dunes are even rarer. The Tularosa Basin is home to the only gypsum dunefield of this size because of the convergence of several geographical coincidences. First, an ancient sea deposited massive amounts of gypsum here several hundred million years ago, providing the basic material to form the dunes. Next, tectonic plate movement created the Tularosa Basin, which is a closed basin; picture a bathtub without a drain – once gypsum-infused runoff from the mountains reaches the basin’s low point, there’s nowhere else for it to drain, so it gathers into a seasonal lake or playa. This playa provides a nursery for selenite crystals to grow and then eventually break down into gypsum sand.
Finally, a hidden feature of this incredible landscape provided the final ingredient: a shallow water table! Throughout the dunefield, the water table is a mere 12-36 inches below the surface, and it keeps the dunes at about 99% humidity. The groundwater also acts as an anchor, holding the dunes together and cementing them to the earth. At any given time, only the top couple of inches of sand are dry enough to be picked up and blown away by the wind. It’s this geographic anomaly that allowed 275 square miles of gypsum sand to pile up and stick in the Tularosa Basin.
Truly one of the most amazing places you will ever see.
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