Why are the stones made by glacier not smooth?

Stones shaped by glaciers are often not smooth due to the grinding and scraping action of the ice as it moves over the landscape. This process, known as glacial abrasion, can create jagged edges and irregular surfaces on the rocks. Additionally, the stones can be mixed with other debris and sediment, which further contributes to their rough texture. As a result, glacially transported stones often exhibit a rugged appearance rather than a polished finish.