Glaciers 4.0 / 5 based on 2 ratings ? GeographyGlacial landscapes and processesGCSEAQA Created by: mollblakeCreated on: 31-03-14 19:33 What is a glacier? A slow-moving river of ice. 1 of 17 Where are they formed? In upland areas where snow accumulates to a depth of over 15m. 2 of 17 What happens to the snow? It is compressed to form ice known as firn. 3 of 17 What does gravity do to the glacier? It causes the glacier to flow downhill. 4 of 17 What is the end of a glacier known as? A snout. 5 of 17 What are crevasses? Deep cracks in a glacier. 6 of 17 What is a glacial surge? A rapid advance of a glacier. 7 of 17 What is a glacial surge caused by? A build-up of melt water which reduces friction. 8 of 17 What is freeze-thaw weathering? The water in a crack freezes and expands, putting pressure on the rock, causing it to fracture and break apart. 9 of 17 What is plucking? The rocks become stuck to the ice and are then pulled away from the valley sides and floor as the glacier moves downhill. 10 of 17 What is abrasion? Eroded material is transported by the glacier and scrapes along the valley sides and floor, wearing it away. 11 of 17 What is a corrie? A large bowl-shaped hollow found in upland areas where glaciers are formed. 12 of 17 What is an arete? A narrow ridge with steep sides between two corries. 13 of 17 What is a pyramidal peak? A mountain with a sharp, pointed summit. 14 of 17 What is a glacial trough valley? A U-shaped valley that has been eroded as a glacier moves downhill. 15 of 17 What is a ribbon lake? A long, narrow lake found in the bottom of glacial troughs. 16 of 17 What is a truncated spur? A spur that has had its end cut off by a glacier flowing down a valley that was previously formed by a river. 17 of 17
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