Frequency: Glacial processes appear in OCR B J384 Paper 1 (Our Natural World) and AQA 8035 Paper 1 (Living with the Physical Environment). This is a core glaciation topic — process mechanism questions appear in virtually every exam sitting.
Typical Question Stems
- "Explain the process of plucking." (3 marks) — mechanism question
- "Explain how abrasion erodes the valley floor." (4 marks) — mechanism + outcome
- "Describe and explain how a glacier transports material." (4 marks) — three transport positions + particle shape
- "Explain the difference between till and fluvioglacial deposits." (4 marks) — comparison question
- "Using named examples, explain the evidence for past glaciation in the UK." (6 marks) — evidence + named examples
- "Explain the formation of a terminal moraine." (4 marks) — single landform formation
Level 1 → Level 2 → Level 3 in Extended Answers
Level 1 answer (simple statement, 1-2 marks): "Glaciers erode rock by plucking and abrasion." This names the processes correctly but gives no mechanism — an examiner cannot award more than basic marks for a bare statement.
Level 2 answer (developed explanation, 3-4 marks): "During plucking, the glacier freezes onto bedrock joints on the downhill side of rocky obstacles. As the glacier moves forward, it pulls the frozen-on blocks away from the bedrock, leaving a jagged, irregular surface. Abrasion uses the blocks produced by plucking as tools — they are embedded in the base of the glacier and dragged over the bedrock, scratching and grinding it to produce parallel striations and fine rock flour." This explains the mechanism of each process and includes the product (striations, rock flour).
Level 3 answer (linked analysis, 5-6 marks): "Plucking and abrasion work together in a positive feedback loop that accelerates glacial erosion over time. Plucking operates primarily on the lee (downhill) side of bedrock obstacles, where reduced pressure allows meltwater to refreeze in rock joints. As the glacier moves forward, these frozen-on blocks are quarried away, exposing fresh, irregularly fractured rock surfaces. These angular blocks become incorporated into the base of the glacier as subglacial debris — and immediately become tools for abrasion. The more debris plucking produces, the more tools are available for abrasion; the more abrasion occurs, the more rock flour is generated, which lubricates the glacier base and increases basal sliding velocity, in turn enabling more efficient plucking. The contrasting surfaces left by the two processes — the smooth, striated stoss face and the rough, jagged lee face of a roche moutonnée — provide diagnostic field evidence that both processes operated simultaneously at the same location." This answer links processes in a feedback mechanism, introduces an intermediate concept (roche moutonnée), and explains how field evidence connects to process understanding.
Common Command Words and What They Require
| Command Word | What to Do | Typical Marks |
|---|---|---|
| Name / State | One or two words — no explanation needed | 1 mark each |
| Describe | Say what it is / what it looks like — no explanation of why | 2–3 marks |
| Explain | Give the mechanism — the cause-and-effect chain. Use "because", "this causes", "as a result" | 3–6 marks |
| Compare | State similarities AND differences with direct reference to both items | 3–4 marks |
| Using named examples | You MUST include a named place — a vague "a glacier in the Alps" will not score the named example mark | Named example = 1 extra mark |
This exam focus covers Exam Connection — How This Topic Is Tested within Glacial Processes for GCSE Geography. Revise Glacial Processes in Glacial Landscapes in the UK for GCSE Geography with 15 exam-style questions and 20 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 15 of 17 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Glacial Processes
What term describes the zone in a glacier where ice is lost through melting, evaporation and calving?
Explain how abrasion erodes the valley floor beneath a glacier.
Quick recall flashcards
What is firn (névé)?
Partially compacted, granular snow that forms the intermediate stage between fresh snow and dense glacial ice.
What is a glacial budget?
The balance between accumulation and ablation. Positive budget = glacier advances. Negative budget = glacier retreats.