A composite radar image of Tanezrouft Basin in the Algerian Sahara -- a landscape of hills, basins, steep canyon walls, stone plateaus and multi-story sand dunes. Wind erosion formed the concentric loop patterns in the sedimentary rock, and very low cliffs and faults appear bright. (ESA) |
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These clockwise and counterclockwise ‘Von Karman vortices’ south of the Canary Islands off the northwest coast of Africa were created as wind blowing from the north over the Atlantic was disturbed by the archipelago. (ESA) |
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