This image from NASA Mars Reconnaissance Orbiter shows the scarp that demarcates the boundary between layered deposits covering the north polar region and the lower surrounding terrain, which includes sand dunes. Original release date March 3, 2010.
This image from NASA Mars Reconnaissance Orbiter shows the scarp that demarcates the boundary between layered deposits covering the north polar region and the lower surrounding terrain, which includes sand dunes. Original release date March 3, 2010.