A drumlin is a streamlined, egg-shaped hill of glacial till. Length is typically 100 m to 1 km, with heights of 5 m to 50 m.

What is the typical elongation ratio of a drumlin?

A drumlin is usually about two and a half times as long as it is wide. The ratio rises where ice moved faster.

What is a drumlin swarm?

A drumlin swarm is a field of many drumlins with the same alignment. The pattern is often described as a basket of eggs landscape.

Give a named drumlin field in the British Isles.

Clew Bay in County Mayo, Ireland, contains a drowned drumlin swarm forming hundreds of small islands. The Vale of Eden and Ribblesdale carry large fields in northern England.

Give one explanation for how drumlins form.

Till already on the valley floor is moulded by ice moving over it and streamlined into a low hill. A boulder or bedrock knob can act as the initial obstacle.

Eduqas A-Level Geography A110QS

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Glaciated Landscapes

Drumlins and lowland glacial deposition

2 things to know
Component 1 Section A

Overview

Shape of a drumlin in relation to ice flow, typical elongation ratio of a drumlin and drumlin swarm.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Define a drumlin.

Key term

Describe the shape of a drumlin in relation to ice flow.

Questions from this subtopic

Each one with the model answer underneath.

1
Define a drumlin.
Model answer
A drumlin is a streamlined, egg-shaped hill of glacial till. Length is typically 100 m to 1 km, with heights of 5 m to 50 m.
2
Describe the shape of a drumlin in relation to ice flow.
Model answer
The stoss end is blunt, steep and faces up-glacier. The lee end tapers gently away in the direction the ice was moving.
3
What is the typical elongation ratio of a drumlin?
Model answer
A drumlin is usually about two and a half times as long as it is wide. The ratio rises where ice moved faster.
4
What is a drumlin swarm?
Model answer
A drumlin swarm is a field of many drumlins with the same alignment. The pattern is often described as a basket of eggs landscape.
5
Give a named drumlin field in the British Isles.
Model answer
Clew Bay in County Mayo, Ireland, contains a drowned drumlin swarm forming hundreds of small islands. The Vale of Eden and Ribblesdale carry large fields in northern England.
6
Give one explanation for how drumlins form.
Model answer
Till already on the valley floor is moulded by ice moving over it and streamlined into a low hill. A boulder or bedrock knob can act as the initial obstacle.

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