Lake district - erosional

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  • Blue Water - Lake district - Erosional Landform
    • Overtime, progressive headwall erosion allows cirque glaciers to cut backwards into an upland plateau.
      • 1. A citque is an armchair shaped hollow, high on a mountain with steep back and side walls. After glaciation, the hollow may be filled by a small lake
      • 2. Main cause of erosion in cirques is rotational flow. At the back of the cirque and in the basin the rotational flow quarries the bedrock
    • Cirque growth may eventually progress to the point where two adjacent headwalls are only separated by a narrow ridge called an arete, such as Striding Edge and Swirral Edge on Helvellyn in the Lake District
      • 1. An arête is a knife-edge ridge. It is formed when two neighbouring corries run back to back.
      • 2. As each glacier erodes either side of the ridge, the edge becomes steeper and the ridge becomes narrower
      • 3. A pyramidal peak is formed where three or more corries and arêtes meet.
    • Ullswater a ribbon Lake in the Lake District
      • 1. A ribbon lake or lake is a long and narrow, finger-shaped lake, usually found in a glacial trough.
      • 2. its formation begins when a glacier moves over an area containing alternate bands of hard and soft bedrock
      • 3. The sharp-edged boulders that are picked up by the glacier and carried at the bottom of the glacier erode the softer rock more quickly by abrasion, thus creating a hollow called a rock basin.
      • 4. On either side of the rock basin, the more resistant rock is eroded less and these outcrops of harder rock are known as rock bars, filling up the rock basin and creating a ribbon lake.

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