Glacial Deposition and Landforms: Understand glacial deposition, including the formation of till and outwash, and how ice shaped the UK's physical landscape.
Glacial Deposition and Landforms is part of Section C: Physical landscapes in the UK in GCSE AQA Higher Geography.
6 min
Reading time
25
Lessons in this topic
GCSE AQA Higher
Pathway
Reviewed by Revise Right
Content review
Glacial Deposition and Landforms: Understand glacial deposition, including the formation of till and outwash, and how ice shaped the UK's physical landscape.
Use this lesson to stay inside Section C: Physical landscapes in the UK while connecting the detail back to the wider Living with the physical environment topic.
Read the core explanations from Glacial Deposition and Landforms before testing yourself from memory.
Picture a conveyor belt carrying rubble across a landscape. While the belt moves, it carries everything with it. The moment the belt slows or stops, the rubble drops. Glaciers work in exactly the same way — and understanding when and why they drop their load is the key to understanding every depositional landform you need to know.
During the last ice age, ice sheets and valley glaciers covered much of the UK. As they moved, they picked up enormous quantities of rock debris through processes like plucking and abrasion. This material was carried within the ice, on top of it, and beneath it. When conditions changed, that debris was deposited — and the landforms left behind are still visible across the UK today, from the drumlin fields of County Down in Northern Ireland to the moraines of the Lake District.
There are two main types of glacial deposit, and examiners expect you to know the difference. Till is dropped directly by the ice itself — it is completely unsorted, meaning boulders, gravel, sand, and clay all sit jumbled together. Outwash is carried and deposited by meltwater streams flowing away from the glacier snout. Because water sorts material by weight, outwash is layered and graded, with coarser particles close to the ice and finer particles further away.
| Feature | Till | Outwash |
|---|---|---|
| Deposited by | Ice directly | Meltwater streams |
| Sorting | Unsorted — mixed particle sizes | Sorted — graded by size |
| Location | At or beneath the glacier | Beyond the glacier snout |
| Typical landforms | Moraines, drumlins | Outwash plain (sandur) |
Now that you know why glaciers deposit, you can start to see how specific landforms are created. Moraines are the most straightforward depositional landforms — they are ridges or mounds of till left behind by a glacier. The type of moraine depends on where the debris was deposited relative to the ice.
Terminal moraines are particularly useful to geographers because they act as markers. By studying their position, scientists can reconstruct exactly how far the ice extended during the last glacial period. In the UK, terminal moraines in areas like the Vale of York give us clear evidence of where the ice sheet halted.
Moraines form where ice stops. Drumlins form where ice keeps moving — and that difference in process produces a completely different shape. A drumlin is a smooth, elongated hill of till that was moulded beneath an active glacier. Think of it like clay being shaped under a moving hand: the ice streamlines the sediment into a teardrop form aligned with the direction of ice flow.
Drumlins rarely appear alone. They tend to occur in large groups called drumlin fields or 'basket of eggs' topography — a name that captures the way dozens of smooth oval hills cluster together across a lowland area. The drumlin fields of the Eden Valley in Cumbria and County Down in Northern Ireland are classic UK examples.
The exact mechanism of drumlin formation is still debated by geographers, but the key exam point is clear: drumlins are formed by deposition and reshaping beneath moving ice, their long axis is parallel to ice flow, and the stoss end is steeper than the lee end. You can use the shape of a drumlin to work out the direction the glacier was travelling.
Beyond the terminal moraine, meltwater streams carry sediment away from the glacier and spread it across a broad, flat area called an outwash plain (also known by the Icelandic term sandur). This is where the sorted nature of outwash becomes visible in the landscape.
As meltwater loses energy moving away from the ice, it deposits the heaviest material first. Coarse gravels and sands settle close to the snout; fine silts and clays are carried further before being deposited. The result is a gently sloping plain with a clear pattern of particle size — coarser near the ice, finer further away. This grading is called sorting, and it is the defining characteristic that separates outwash from till.
Everything covered so far connects to a bigger picture: ice was one of the most powerful forces that shaped the physical landscape of the UK. During the Pleistocene epoch (roughly 2.6 million to 11,700 years ago), repeated glaciations covered much of Britain. The erosional and depositional processes of these glaciers left a legacy that defines upland and lowland landscapes across the country.
In upland areas like the Lake District, Snowdonia, and the Scottish Highlands, erosional landforms dominate — corries, aretes, U-shaped valleys, and ribbon lakes. But in lowland areas beyond the ice margin, depositional landforms take over. The drumlin fields of Northern Ireland, the moraines of East Anglia, and the outwash plains of the Midlands all record the extent and behaviour of past ice sheets.
This contrast between erosional uplands and depositional lowlands is a key theme for AQA. The physical landscape of the UK today cannot be understood without recognising the role that glacial ice played in sculpting it — both by removing material and by depositing it elsewhere.
You now have the knowledge — the final step is translating it into marks. AQA questions on glacial deposition typically use the command words 'describe', 'explain', or 'compare'. Each one demands a different response structure, and mixing them up is one of the most common ways students lose marks.
Worked example: Answering an 'Explain' Question on Drumlin Formation
Explain how drumlins are formed. [4 marks]
Answer: A four-point answer covering: definition of drumlin, the process of moulding by moving ice, the asymmetric shape linked to ice flow direction, and a named UK example or reference to drumlin fields.
Published by Revise Right. Use the official specification reference to check the requirements for your course. Content updated: 2026-03-23.
Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.
During the last ice age, ice sheets and valley glaciers covered much of the UK. As they moved, they picked up enormous quantities of rock debris through processes like plucking and abrasion. This material was carried within the ice, on top of it, and beneath it. When conditions changed, that debris was deposited — and the landforms left behind are still visible across the UK today, from the drumlin fields of County Down in Northern Ireland to the moraines of the Lake District.
By the end of this lesson, you should be able to Explain why glaciers deposit sediment, distinguishing between till and outwash; Describe the distinctive landforms created by glacial deposition; Explain how ice shaped the physical landscape of the UK; Compare the characteristics of different depositional landforms.
Read each section, then close the notes and explain the idea from memory. Check your explanation against the page and finish with an exam question from Living with the physical environment.