Boulders of various sizes (a few meters up to ~20 meters across) scattered across the lunar surface. From where do the boulders originate? NAC M170605553LR, image width 510 m [NASA/GSFC/Arizona State University].
Granular debris flows cascade down the wall of a young crater. Geologically these are young features - but how young? NAC M185961505L, downslope to lower right, north is down, image width ~696 m [NASA/GSFC/Arizona State University].