Shifting Sands -- Detail

Small barchan dunes (left image - horizontal linear features below and next to Sandwich Bay) occur in the northern section of the Namib Sand Sea. Terrestrial barchan dunes indicate a unidirectional wind source. The long features from the lower right to upper center are linear dunes. On the right is a Mars Global Surveyor image of barchan dunes located near the north polar cap (74.7°N, 61.4°W). The light color of the dunes is due to a covering of frost.

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