What Moves Gravel Size Gypsum Crystals Around the Desert?
In the stark, sun bleached deserts of the American Southwest and other arid regions, strange trails sometimes appear thin lines etched in the sand behind small, gravel sized gypsum crystals. The crystals have moved, often in large numbers, yet there are no footprints, no windblown debris, and no signs of animal activity. What’s causing these […]
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