Map of Glaciated Areas

Landforms created by glacial erosion

The landforms created by glacial erosion are: 1. Corries, cirque, cwm.2. Arêtes3. Pyramidal Peaks4. Glacial Troughs (U-Shaped Valleys)5. Truncated Spurs6. Hanging Valleys

Cirque, Corrie, Cwm

How is a cirque formed?

• 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 ice is pulled downhill by gravity, it doesn’t move straight down, it moves in a curved way

• The hollow is deepened and widened by the corrie glacier through the processes of abrasion and plucking.

• This over deepening leads to an ‘armchair’ shape characteristic of a corrie and causes a ‘rock lip’ to be formed.

• Plucking and freeze-thaw mean that the back wall of the corrie is very steep.

• When the ice melts, a small lake may be left behind the lip, this is called a corrie-lake or a tarn.

Arêtes are ‘knife-edged’ ridges formed between two corries which have formed next to each other.

Pyramidal peaks formed when three or more corries form around a mountain. They cut backwards to leave a “horn” or “pyramidal peak” in the middle.

1. Between truncated spurs are hanging valleys which have not been eroded as deeply as the main valley.

2. Interlocking spurs are truncated as the glacier cuts straight through the landscape.

3. The river that flows through the valley after the ice age is described as a misfit stream.

Characteristics of a glacial trough

FEATURES OF GLACIAL DEPOSITION1. Till2. Terminal moraine3. Recessional moraine 4. Lateral moraine5. Medial moraine6. Push moraine

7. Drumlins8. Esker9. Kames10. Kettles11. Outwash Plains