Alluvial Fans in Saheki Crater, Mars الصورة اليومية من وكالة الفضاء ناسا

Alluvial fans are gently-sloping wedges of sediments deposited by flowing water. Some of the best-preserved alluvial fans on Mars are in Saheki Crater, an area that has been imaged many times previously. via NASA http://ift.tt/1UKgLwX