Define subglacial transport.

Subglacial transport is the movement of debris at the base of the glacier. Material plucked from the bedrock and debris that has worked its way down make up the load.

How does debris move from the surface to the base of a glacier?

Debris falls into crevasses and moulins and works downward through the ice. Compressional flow can then carry it back up along shear planes near the snout.

Describe the characteristics of sediment deposited directly by ice.

Glacial sediment is angular, unsorted and unstratified. Particles of every size from clay to boulders sit mixed together.

Why is glacial sediment angular?

Fragments are frozen into the ice and carried rather than rolled along a bed. Particles rarely collide, so their edges are never rounded off.

Eduqas A-Level Geography A110QS

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Glaciated Landscapes

Glacial and fluvioglacial transport

2 things to know
Component 1 Section A

Overview

Supraglacial transport, englacial transport and subglacial transport.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Define supraglacial transport.

Key term

Define englacial transport.

Questions from this subtopic

Each one with the model answer underneath.

1
Define supraglacial transport.
Model answer
Supraglacial transport is the carriage of debris on the surface of a glacier. Rockfall and avalanche from the valley sides supply most of that material.
2
Define englacial transport.
Model answer
Englacial transport is the carriage of debris within the body of the ice. Surface material falls into crevasses or is buried by later snowfall.
3
Define subglacial transport.
Model answer
Subglacial transport is the movement of debris at the base of the glacier. Material plucked from the bedrock and debris that has worked its way down make up the load.
4
How does debris move from the surface to the base of a glacier?
Model answer
Debris falls into crevasses and moulins and works downward through the ice. Compressional flow can then carry it back up along shear planes near the snout.
5
Describe the characteristics of sediment deposited directly by ice.
Model answer
Glacial sediment is angular, unsorted and unstratified. Particles of every size from clay to boulders sit mixed together.
6
Why is glacial sediment angular?
Model answer
Fragments are frozen into the ice and carried rather than rolled along a bed. Particles rarely collide, so their edges are never rounded off.

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