/sci/ - Science & Math

'rollin
http://lroc.sese.asu.edu/posts/1110
>Sometimes, material moves down the slope rapidly in discrete chunks. Running from the outcrops to the rim of the partially buried crater is a track etched by a rolling boulder bigger than a bus. Perhaps a moonquake shook it loose. The boulder bounced and rolled toward the partially buried crater, plowing a path that is still visible through the loose material of the slope. When it reached the rim of the partially erased crater, its path curved and it slowed to a stop.