APOD: 2010 August 15 - Layered Hills in Arabia Terra on Mars

apod.nasa.gov — Why are some hills on Mars so layered? The answer is still under investigation. Clearly, dark windblown sand surrounds outcropping of light sedimentary rock across the floor of crater Arabia Terra. The light rock clearly appears structured into many layers, the lowest of which is likely very old. Although the dark sand forms dunes... Aug 15, 2010 View in Crawl 4