abrasion [geomorph]

The mechanical wearing, grinding, scraping, or rubbing away (or down) of rock surfaces by friction and impact, in which the solid rock particles transported by wind, ice, waves, running water, or gravity are the tools of abrasion. The term corrasion is essentially synonymous. Also, an abraded place or the effect of abrading, such as the abrasion left by glacial action. v. abrade. Cf: attrition.