Dust and sand slide down slopes on Mars in little avalanches. Dark slope streaks are thought to be the result of the relatively bright colored dust avalanching down slopes, revealing the darker, coarser sand underneath. This image is the latest in a sequence of images of this crater that started in 2013. The goal is to watch the dusty slopes, and try to understand more about the processes that drive these little avalanches. https://photojournal.jpl.nasa.gov/catalog/PIA23757