Plucking is a process of erosion that occurs during glaciation). As ice and glaciers move, they scrape along the surrounding rock and pull away pieces of rock which causes erosion. Plucking occurs at the base of the glacier as the ice drags along an uneven surface. The weight and moving force of the ice will break the bedrock and incorporate the fragments into the glacier. Plucking is a glacial phenomenon that is responsible for the weathering and erosion of pieces of bedrock, especially large "joint blocks"). Eventually, these joint blocks come loose and become trapped in the glacier. In this way, plucking has been linked to regelation). Rocks of all sizes can become trapped in the bottom of the glacier. Joint blocks up to three meters have been "plucked" and transported. These entrained rock fragments can also cause abrasion along the subsequent bedrock and walls). Glacial plucking both exploits pre-existing fractures in the bedrock and requires continued fracturing to maintain the cycle of erosion).