UA's HiRISE camera finds Mars' ice cap fluctuations
These eight-tenths-of-a-mile sections photographed by the HiRISE camera show, from left, early spring, when the ground is covered by a seasonal layer of dry ice about 2 feet thick; and later spring, when the ice cracks, releasing dark sand from the dune below. When pressurized gas trapped below the ice layer is released, it carries along sand and dust to the top of the ice layer, where it is dropped in fan-shaped deposits downhill and downwind (panels C and D). The final panel shows more and more of the dark dunes as the overlying layer of seasonal ice evaporates back into the atmosphere.
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