Exam Tips for Glacial Landforms
This exam tips covers Exam Tips for Glacial Landforms within Glacial Landforms for GCSE Geography. Revise Glacial Landforms in Glacial Landscapes in the UK for GCSE Geography with 17 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 16 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 15 of 16
Practice
17 questions
Recall
20 flashcards
💡 Exam Tips for Glacial Landforms
🎯 Common Question Types and Mark Allocations:
- "Describe how a corrie/arête/U-valley forms" — 4–6 marks: processes must be named AND sequenced; the cause-chain structure earns full marks.
- "Using a named example" — always required in 4-mark+ questions; have 2 corries, 1 arête, 1 U-valley, and 1 ribbon lake memorised with locations.
- "What is the difference between X and Y?" — contrast the formation process AND the visual appearance; use "whereas" to link contrasting points.
- "How do drumlins provide evidence of past ice movement?" — 3 marks: stoss/lee orientation tells direction; drumlin alignment shows ice travel route; drumlins in swarms show the scale of the former ice sheet.
📝 Key Command Words — What Each Requires:
- Describe: Visual features only — shape, size, position, what you see. NOT the formation process.
- Explain (formation): Sequence of processes with cause-effect links; "because", "which means that", "as a result" are your connective words.
- Using a named example: Specific UK location required — not "a valley in Wales" but "Nant Ffrancon, Snowdonia."
- Compare: State similarities AND differences; always use "whereas" or "however" to explicitly contrast the two features.
⚠️ Common Mistakes to Avoid:
- Saying "the glacier carved a V-shaped valley" — glaciers make U-shapes; rivers make V-shapes. Never confuse them.
- Forgetting that ribbon lakes (e.g. Windermere) are erosional features — the rock basin was eroded by the glacier. The moraine dam may also help retain the water, but the basin itself is erosional.
- Describing glacial landforms without naming the process — "the hollow got bigger" scores less than "abrasion deepened the floor while plucking steepened the back wall."
- Saying drumlins are erosional — they are depositional (made of till, not carved from bedrock).
- Getting drumlin orientation backwards — the BLUNT (stoss) end faces the direction the ice came FROM; the pointed (lee) end faces the direction the ice was going TO.
- Missing the distinction between sorted (outwash) and unsorted (till) sediment — this difference is frequently tested.
- Giving general answers when the question says "using a named example" — always include the specific UK place name and a key fact about it.
Quick Check: Write a Level 3 answer to: "Explain the formation of a U-shaped valley." Include a named UK example and at least two named processes.
Example Level 3 answer: "A U-shaped valley forms when a glacier moves through a pre-existing river valley, transforming its V-shaped cross-profile into the characteristic U-shape. Before glaciation, rivers had carved narrow V-shaped valleys with interlocking spurs — ridges projecting from alternate sides. When the climate cooled and glaciers formed in the uplands, ice began to flow downslope through these valleys. Unlike a river, which only contacts the valley bottom, the glacier filled the valley from floor to wall and eroded in all directions simultaneously. Abrasion — the grinding of embedded rock fragments against the valley floor and sides — deepened and widened the valley, smoothing the floor. Plucking tore angular blocks from the valley sides and floor. Crucially, the glacier was too large and powerful to deflect around the interlocking spurs, so it eroded straight through their ends — creating the truncated spurs (flat-fronted cliff faces) visible on valley sides today. After deglaciation, the broad flat floor and steep straight sides of the U-shaped trough were revealed. Nant Ffrancon in Snowdonia is a classic UK example — its flat valley floor is occupied by a misfit stream (Afon Ogwen) that is far too small to have carved the oversized valley, and truncated spurs are visible on both valley sides."
Quick Check: How do the Norber Erratics in Yorkshire demonstrate that glaciers once covered this area? What additional evidence do the limestone pedestals provide?
The Norber Erratics are boulders of Silurian greywacke (a hard, grey metamorphic rock) resting on a surface of Carboniferous limestone. These two rock types are geologically distinct — the greywacke does not occur in the local bedrock beneath it. The greywacke source outcrops approximately 2.5 km to the north. The only mechanism capable of transporting large boulders 2.5 km across the grain of the landscape and depositing them on the limestone surface is a glacier — the boulders are therefore erratics, carried southward by ice and dropped as the glacier melted. This proves that glacier ice once covered this area. The limestone pedestals provide additional evidence: the limestone around the base of each boulder has been dissolved by slightly acidic rainwater since the ice retreated approximately 10,000 years ago, but the limestone directly under each boulder was protected by the boulder and has not dissolved. The pedestals — up to 30 cm high — indicate how much limestone has been removed by chemical weathering in the 10,000 years since deglaciation, providing a rough measure of limestone dissolution rates in this environment.