Mars’ Shifting Sands
As spring now dawns on the Northern Hemisphere of Mars, sand dunes near the pole, as pictured above, are beginning to thaw. The carbon dioxide and water ice actually sublime in the thin atmosphere directly to gas. Thinner regions of ice typically defrost first revealing sand whose darkness soaks in sunlight and accelerates the thaw.
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https://www.nasa.gov/image-detail/mars-shifting-sands/
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