Glacial landforms of erosion
A complete lesson on the various glacial landforms of erosion, with a focus on corrie formation. It will help students to describe and explain the formation of the main landforms created by glacial erosion: corries (cirques or cwms), tarns (corrie lakes), arêtes and pyramidal peaks.
The starter in the PowerPoint is a photo of a U-shaped valley to get students thinking about how landforms are created by processes that are no longer visible today, such as glaciation. Students solve anagrams of keywords and watch video clips about glacial processes, including freeze-thaw weathering, plucking, abrasion and rotational slip. They then identify glacial landforms from photographs before completing a worksheet.
In the worksheet, students read information about the formation of a corrie and complete a series of simple activities that consist of filling in gaps in sentences and annotating a photograph. The tasks focus on the glacial landscape of Snowdonia in North Wales.
A practice exam question on glacial landforms in Snowdonia is included at the end of the PowerPoint. There is also a plenary in which students annotate a photo.
Teaching notes include guidance for the PowerPoint tasks and answers to the questions in the worksheet.
An extract from the information sheet:
Corries are large hollowed out depressions found on the upper slopes of glaciated valleys. They have a steep back wall, and a raised lip at the front. Corries often contain small lakes, known as tarns. They were formed during the last Ice Age. At first, snow accumulates in a small hollow on a hillside. This is usually on the northern side of the mountain, which is more likely to stay in the shade during the summer, and so melting is reduced. Nivation (snow-related processes such as freeze-thaw weathering, meltwater and slumping) enlarge the hollow, enabling more snow to collect.
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