关于这张图
This observation from NASA Mars Reconnaissance Orbiter spacecraft shows a terrain of relatively smooth region that transitions into sharp ridges called yardangs on Apollonaris Patera. These ridges, aligned in the nearly same direction, are called yardangs. Yardangs are not unique to Mars. Many yardangs can be found on Earth, in very dry regions with strong prevailing winds. Yardangs are formed when a surface that is composed of materials of differing strengths (i.e., of both harder and softer materials) is shaped by the abrasive action of sand and dust carried by the wind. In this case, and g…
