🎯 Common Question Types
- "Explain the process of [plucking / abrasion / freeze-thaw]" (3–4 marks) — always give the full mechanism, not just a definition
- "Explain the difference between [till / fluvioglacial sediment]" (3–4 marks) — use the sorted/unsorted and stratified/unstratified contrast
- "Describe the formation of [terminal moraine / lateral moraine]" (3 marks) — state where it forms AND how the debris got there
- "Using evidence from named locations, explain how we know glaciers once covered Britain" (6 marks) — this requires specific named places with specific evidence (striations, erratics, moraines)
📝 Key Command Words to Watch
- "Explain" demands mechanisms — never just name a process; always follow with "because...", "this is because...", or "as a result..."
- "Compare" demands both sides — explicitly contrast till vs fluvioglacial; do not describe one and then the other separately
- "Using named examples" — this phrase is non-negotiable. Name a specific glacier, specific location, or specific landform with a place name
- "Describe and explain" — many students explain without describing. Describe = appearance/characteristics; explain = process/mechanism. Do both.
⚠️ Common Mistakes to Avoid
- Reversing till and fluvioglacial: Students frequently say till is sorted and fluvioglacial is unsorted — this is the exact opposite of reality. Repeat to yourself: "Ice does not sort; water does."
- Confusing plucking with abrasion effects: Plucking leaves a JAGGED surface; abrasion leaves a SMOOTH, STRIATED surface. Do not say abrasion produces angular blocks — it produces rock flour and smooth surfaces.
- Saying glaciers only move downhill in a straight line: Glaciers can also flow in rotational paths (in cirques), and their surface can move faster than their base (creating internal deformation layers).
- Forgetting that retreating glaciers still move forward: "Retreat" means the snout position moves up-valley because ablation exceeds accumulation — the ice itself continues to flow downhill throughout.
- Vague named examples: "A glacier in the Lake District" will not score the named example mark. Use "the Rhône Glacier, Switzerland" or "Rydal Cave, Lake District" — specific locations with specific evidence.
Quick Check: Explain why plucking is most effective on the lee (downhill) side of rocky obstacles rather than the stoss (uphill) side.
On the stoss (uphill) side of an obstacle, the ice is compressed against the rock under high pressure. This increased pressure actually lowers the melting point of ice, causing some basal meltwater to form — the ice melts slightly under pressure and tends to flow around the obstacle rather than bond to it. On the lee (downhill) side, the pressure drops as the ice moves past the top of the obstacle. This drop in pressure causes the meltwater to refreeze — and as it refreezes into the rock joints on the lee side, it bonds the ice firmly to the rock. When the glacier continues moving forward, it pulls this frozen-on rock with it, plucking blocks away. So plucking requires the combination of meltwater (produced by pressure) and refreezing (caused by pressure drop) — which only happens on the lee side.
This exam tips covers Exam Tips — Glacial Processes 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 16 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.