A wind-levelled surface

A Piece of Mars: In this 676×380 m (0.42×0.24 mi) scene, the high-standing hills here were all carved by sandblasting, by a wind that probably blew from right to left. Ripples in the valleys show that this erosion is still occurring today. (HiRISE ESP_041864_1745, NASA/JPL/Uni. of Arizona)