Diagram of glacial plucking and abrasion. If a series of cirques are arranged one above the other at different elevations, it is … The process by which a glacier melts and then refreezes around a rock and then as the glacier moves it 'plucks' the rock out from its position Abrasion Rocks embedded in the glacier scrape away at rocks in the valley sides and floor eroding them. Figure 4. This diagram, which comes from the excellent website, www.antarcticglaciers.org, shows what happens when glaciers meet the sea.It explains how glaciers become ice shelfs and how the melting of ice shelfs occurs on the top of the glacier, via the sun, and underneath the glacier, via the ocean water. It is shaped like an amphitheater with an opening on the downhill side and a steep cupped section with cliff-like slopes on three sides. Huge valley glacier fed by several corrie glaciers. Plucking is when melt water from a glacier freezes around lumps of cracked and broken rock. Also known as till. Abrasion is when rock frozen to the base and the back of the glacier scrapes the bed rock. Cirques formed by glaci… Glacially plucked granitic bedrock near Mariehamn, Åland Islands. 10. Glacier Features. After Ice Age valley glacier leaves a glacial trough and often a long, narrow ‘ribbon lake’. Striations are carved out by angular debris embedded in the base of the glacier. This can happen by (i) the scoring (striation) of bedrock by rock particles (usually > 1 cm) embedded in the glacier sole, due to ice flow across a rock surface (see image below); and (ii) the polishing of bedrock surfaces by smaller, silt-sized particles that are dragged across the bedrock1.2. Corries, also known as cwms or cirques, are often the starting point of a glacier. The floor of this valley is bowl-shaped and receives the bulk of the impact of the ice flows from multiple directions and the accompanying rock particles and other debris. A diagram showing erosional glacial features, as follows: 1 is a Pyramidal Peak; 2 is an Arête; 3 is a Corrie or Cirque; 4 is a Corrie Lochan or Tarn; 5 is an Alluvial Fan; 6 is a Ribbon Lake; 7 is a Truncated Spur; 8 is a Misfit Stream; 9 is a Hanging Valley; 10 is a 'U' Shaped Valley This causes the wearing away of the landscape as the glacier behaves like sandpaper. Glacial erosion includes processes that occur directly in association with glacial ice, such as abrasion, plucking, physical and chemical erosion by subglacial meltwater, as well as processes that are enhanced or modified by glaciation. Cirque Stairway. This leaves behind a jagged landscape. The diagram below shows the formation of a corrie, cwm or cirque. Harbor, in Treatise on Geomorphology, 2013. It is almost as if the moving glacier is sanding the rocks with abrasive sandpaper. frost wedging • weathering that occurs when water freezes and expands in cracks. 12. Glaciers erode the underlying rock by abrasion and plucking. Repetition of this causes the crack to expand and eventually the rock cracks creating sharp jagged scree. Climate change can affect glacier stability over a long term. Abrasion occurs when rocks and stones become embedded in the base and sides of the glacier. As a glacier flows downslope, it drags the rock, sediment, and debris in its basal ice over the bedrock beneath it, grinding it. 7. Abrasion occurs when rocks and stones become embedded in the base and sides of the glacier. Glacial Deposition. The corresponding area of study is called glaciology. Abrasion … 9. The lateral morianes join to form a moraine down the middle on the large glacier. 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