 While plucking has generally been thought of as a greater force of geomorphological change, there is evidence that in softer rocks with wide joint spacing that abrasion can be just as efficient.A smooth, polished surface is left behind by glacial abrasion, sometimes with glacial striations, which provide information about the mechanics of abrasion under temperate glaciers.Much consideration has been given to the role of wind as an agent of geomorphological change on Earth and other planets (Greely & Iversen 1987).