Describe the shape of a corrie.

It is a deep, rounded hollow cut into a mountainside, with a steep back wall and side walls and a raised rock lip at its opening, often holding a small lake called a tarn.

What is an arête, and how does one form?

It is a narrow, knife-edged ridge, formed where two corries cut back towards each other until only a thin wall of rock is left between them.

What are truncated spurs?

They are steep, blunt-ended cliffs along the side of a glaciated valley, left where the glacier sliced straight through ridges of land that once jutted out into it.

Describe the cross section of a glacial trough and say how it was cut.

It is steep-sided with a wide, flat floor, giving a U shape, and it was cut when a glacier widened, deepened and straightened a valley that a river had made before the ice arrived.

AQA GCSE Geography 8035

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Glacial Landscapes in the UK

Glacial landforms of erosion, transport and deposition

3 things to know
Paper 1 section C

Overview

The formation of corries, arêtes, pyramidal peaks, truncated spurs, glacial troughs, ribbon lakes and hanging valleys, and the erratics, drumlins and lateral, medial, terminal and ground moraines left by ice.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Explain how a corrie is formed.

Key term

Name the four types of moraine and say where each is found.

Key term

How is a pyramidal peak produced?

Questions from this subtopic

Each one with the model answer underneath.

1
Describe the shape of a corrie.
Model answer
It is a deep, rounded hollow cut into a mountainside, with a steep back wall and side walls and a raised rock lip at its opening, often holding a small lake called a tarn.
2
Explain how a corrie is formed.
Model answer
Snow gathers in a sheltered hollow and compacts into ice, which deepens the hollow by abrasion and plucking as it turns on rotational slip, while freeze-thaw steepens the wall above it.
3
What is an arête, and how does one form?
Model answer
It is a narrow, knife-edged ridge, formed where two corries cut back towards each other until only a thin wall of rock is left between them.
4
How is a pyramidal peak produced?
Model answer
Three or more corries erode back into the same mountain from different sides, leaving a sharp, pointed summit where their steep back walls meet.
5
What are truncated spurs?
Model answer
They are steep, blunt-ended cliffs along the side of a glaciated valley, left where the glacier sliced straight through ridges of land that once jutted out into it.
6
Describe the cross section of a glacial trough and say how it was cut.
Model answer
It is steep-sided with a wide, flat floor, giving a U shape, and it was cut when a glacier widened, deepened and straightened a valley that a river had made before the ice arrived.

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