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Presentation on theme: "These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates that the slide contains activities."— Presentation transcript:

1 These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates that the slide contains activities created in Flash. These activities are not editable. For more detailed instructions, see the Getting Started presentation. 1 of 5 Glacial Landforms © Boardworks Ltd 2011 Glacial landforms

2 © Boardworks Ltd of 5 Snow collects in a natural hollow on the side of a mountain. Over time, further snow collects in the hollow. This extra weight compresses the snow underneath, turning it into ice. The hollow is deepened and widened by the corrie glacier through the processes of abrasion and plucking. rock lip This overdeepening leads to an ‘armchair’ shape characteristic of a corrie and causes a ‘rock lip’ to be formed. How is a corrie formed?

3 © Boardworks Ltd of 5 Arêtes are ‘knife-edged’ ridges formed between two corries. Formation of an arête

4 © Boardworks Ltd of 5 Formation of a glacial trough

5 © Boardworks Ltd of 5 truncated spurs hanging valley misfit stream wide and flat valley floor steep valley sides What are the characteristics of a glacial trough? Interlocking spurs are truncated as the glacier cuts straight through the landscape. Between truncated spurs are hanging valleys which have not been eroded as deeply as the main valley. The river that flows through the valley after the ice age is described as a misfit stream. Characteristics of a glacial trough


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