Aorounga Crater
Aorounga Crater
This image, acquired by the TanDEM-X satellite, shows the Aorounga impact structure in Chad, North Africa. It is 345 million years old, and therefore very heavily weathered. From space, both the inner and outer rings are visible. Here, the strong winds have acted as builders, carving parallel structures into the ground; they consist of wind-resistant, rocky protuberances, referred to as yardangs, through which the sand dunes meander, carried on the wind.
