Stone and pebbles make up most of the Sahara surface in Northern Africa. Erosion ? first by water, now by wind ? has created this landscape of hills, basins, steep canyon walls, stone plateaus and multi-storey sand dunes.
The concentric loop patte [...]
Full story at http://spacefellowship.com/news/art23977/earth-from-space-wind-inspired-design.html
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