Abrading is the process in which surface deposits are removed using abrasives. The advancing glacier acted like an enormous rock tumbler, abrading, fracturing, and rough-polishing the agates. Skin ulcers with redness and scarring also may result from scratching or abrading the skin. Mechanical methods include dusting, picking and cutting, and abrading. Galecki and Vickers [Gal82] performed surface cleaning and abrading with an ice-blasting technique. Willow twigs need to be provided for abrading the continuously growing teeth. "Chlamys opercularis", by abrading the animal tissue when they attach to it. The specific name means "abrading" in Latin.