关于这张图
Gullies are commonly found in the southern mid-latitudes of Mars. In this image from NASA Mars Reconnaissance Orbiter they start near top of a long ridge, and descend into an impact crater that lies at the bottom of the ridge, moving through a rocky layer along the way. Below the layer, the surface is dark and blue in HiRISE enhanced color, suggesting that it is easily erodible sand coating the crater wall. The topography here is also interesting. There are two main features, an impact crater and a long trough called a graben, formed when the surface drops down between two faults. The easter…
