On February 19, 2008, HiRISE captured a series of four landslides taking place along a towering cliff (in places 2,300 feet tall) on the edge of the dome of layered deposits centered on Mars' north pole. This false-color view shows the largest dust cloud, which is about 600 feet (180 m) across and extends about 625 feet (190 m) from the base of the steep cliff at left. The scarp, still capped by white CO2
frost along its top, has slopes of at least 60° in spots. The darkest deposits below form more gentle slopes, less than 20°, while the wavy forms on the flatter areas to the right are dunes. Click here
for more information and to see a larger view.
NASA / JPL / Univ. of Arizona