Processes of glacial and fluvioglacial transport and deposition and the characteristics and formation of associated landforms and landscapes — Eduqas A-Level Geography

Glacial and fluvioglacial processes are fundamental to understanding how ice shapes the landscape, both directly through the movement of glaciers and indirectly via meltwater. This topic covers the mechanisms of transport and deposition by glaciers and their meltwater streams, and the formation of distinctive landforms such as moraines, drumlins, eskers, and kames. Understanding these processes is crucial for interpreting past glacial environments and predicting future landscape changes in a warming world.

In the WJEC A-Level Geography syllabus, this topic sits within the 'Glaciated Landscapes' theme, linking to broader concepts of climate change, geomorphology, and human-environment interactions. Students must grasp the differences between glacial (ice-driven) and fluvioglacial (meltwater-driven) processes, as they produce contrasting landforms. Mastery of this content enables students to analyse landscape evolution, evaluate the impacts of glaciation on human activity, and apply their knowledge to unseen field sketches or photographs in exams.

This topic also provides a foundation for understanding contemporary issues such as glacial retreat, sea-level rise, and the management of glaciated environments for tourism and conservation. By studying the processes and landforms, students develop skills in spatial analysis, diagram interpretation, and critical evaluation of evidence—key competencies for geography exams and beyond.

• →Glacial transport: englacial, supraglacial, and subglacial transport of debris; basal sliding and internal deformation as mechanisms of ice movement.
• →Glacial deposition: lodgement till (plastered onto bedrock) and ablation till (melt-out); formation of terminal, lateral, medial, and ground moraines.
• →Fluvioglacial transport: meltwater streams with high energy and competence; braided channel patterns and seasonal discharge variations.
• →Fluvioglacial deposition: outwash plains (sandur) with graded bedding; eskers (sinuous ridges of sand and gravel from subglacial streams) and kames (mounds from ice-contact deposition).
• →Landform formation: drumlins (streamlined hills from glacial reworking of till); kame terraces (meltwater deposits along valley sides); and varves (annual layers in proglacial lakes).

• Processes of glacial and fluvioglacial transport including supraglacial, englacial and subglacial transfers
• Sediment characteristics (size, shape and sorting) resulting from transport
• Landforms and landscapes of glacial deposition including types of till (ablation, lodgement and deformation)
• Types of moraine (terminal, recessional, lateral, medial and push)
• Drumlins
• Processes of fluvioglacial transport and deposition
• Ice-contact features including eskers, kames, and kame terraces
• Proglacial features including sandurs, varves, kettle holes and kettle lakes

• 💡Use diagrams to illustrate the formation of landforms, ensuring labels are precise
• 💡Clearly distinguish between glacial (ice-contact) and fluvioglacial (meltwater-driven) processes
• 💡Ensure case studies are contemporary (within the last two decades) unless historical context is relevant
• 💡Apply specialised concepts like 'systems', 'thresholds', and 'feedback' to explain landform development
• 💡Use annotated diagrams to show the difference between glacial and fluvioglacial landforms. For example, draw a drumlin with arrows indicating ice flow direction, and label the stoss (up-ice) and lee (down-ice) ends to show asymmetry.
• 💡Always link processes to specific landforms. For instance, explain that lodgement till forms when basal ice melts under pressure, depositing debris that is then compacted by overriding ice—this creates a dense, fissile till characteristic of ground moraine.
• 💡In essays, compare and contrast glacial and fluvioglacial deposition. Highlight that glacial deposits are unsorted and unstratified, while fluvioglacial deposits are sorted and stratified due to the action of meltwater. Use examples like till vs. outwash sand and gravel.

• Confusing glacial till (unsorted) with fluvioglacial deposits (sorted/stratified)
• Failing to distinguish between the processes of transport and the resulting landforms
• Inaccurate use of terminology regarding moraine types
• Neglecting the role of meltwater in fluvioglacial landform formation
• Misconception: All glacial deposits are unsorted. Correction: While till is unsorted, fluvioglacial deposits like outwash are sorted by meltwater, showing graded bedding (coarse to fine downstream).
• Misconception: Drumlins are formed by direct glacial deposition. Correction: Drumlins are formed by the reworking of pre-existing till by overriding ice, creating a streamlined shape; they are erosional and depositional features.
• Misconception: Eskers are formed on the glacier surface. Correction: Eskers form in subglacial tunnels, not on the surface; they are deposited by meltwater streams flowing under pressure within or beneath the ice.