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Glaciated Upland Landscapes and Processes

Glacial landforms of erosion and deposition

  • 3 things to know
  • Paper 1 section A

Overview

Corries, arêtes, tarns, glacial troughs, truncated spurs, hanging valleys, roches moutonnées and what they show of ice direction, ground and terminal moraine, and how corries, arêtes and glacial troughs are recognised on OS maps.

What you need to know

Answer each one before you reveal it.

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Process

What is a corrie and how is one formed?

Key term

What is an arête?

Key term

What is a tarn, and why does water stay in it?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a corrie and how is one formed?

    Model answer

    An armchair shaped hollow high on a mountainside, cut where snow gathered, turned to ice and then deepened the hollow by plucking and abrasion as it rotated.

  2. 2

    What is an arête?

    Model answer

    A narrow, knife edged ridge left standing where two corries have been eroded back towards each other on either side.

  3. 3

    What is a tarn, and why does water stay in it?

    Model answer

    A small lake in a corrie after the ice has gone; the hollow was over deepened by rotating ice and a rock lip was left at the front to hold the water back.

  4. 4

    What is a glacial trough?

    Model answer

    A wide, steep sided valley with a flat floor, cut when a glacier deepened and straightened a valley that had previously been shaped by a river.

  5. 5

    Explain why a glacial trough is U shaped while a river valley is V shaped.

    Model answer

    Ice fills the whole valley and erodes the sides as well as the floor, whereas a river cuts mainly downwards in a narrow channel at the bottom.

  6. 6

    What is a truncated spur?

    Model answer

    A ridge of higher land that once projected into the valley and has been cut off with a steep, blunt end because the glacier could not bend around it.

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