How do glacial systems shape landscapes, and why are glaciated environments both valuable and fragile?
Glaciers as systems with a mass balance, the glacial, fluvioglacial and periglacial processes that create landforms, and the value, threats and sustainable management of past and present glaciated landscapes.
An Edexcel A-Level Geography answer to glaciated landscapes and change, covering the glacial system and mass balance, glacial, fluvioglacial and periglacial processes and the landforms they create, the distribution of past and present ice, and the value, threats and sustainable management of fragile glaciated environments.
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What this dot point is asking
Edexcel wants you to treat a glacier as a system with a mass balance, explain glacial, fluvioglacial and periglacial processes and the landforms they create, describe the distribution of past and present ice, and evaluate the value, threats and sustainable management of fragile glaciated environments.
The glacial system and mass balance
Glaciers move by internal deformation (creep) and, where meltwater lubricates the bed, basal sliding. Warm-based (temperate) glaciers, such as those in the Alps, sit at the pressure-melting point and move faster and erode more than cold-based (polar) glaciers frozen to their beds, such as parts of the Antarctic ice sheet. Mass balance can be quantified: if a glacier gains water-equivalent of snow in the accumulation zone but loses to ablation, the net balance of drives retreat. The Mer de Glace in the French Alps has retreated more than 2 km since 1850 and continues to thin, a direct measure of a sustained negative balance.
Glacial, fluvioglacial and periglacial processes and landforms
Glaciers erode by plucking (ice freezing onto and pulling away rock) and abrasion (embedded debris scouring the bed), with freeze-thaw supplying angular debris and nivation initiating hollows.
These landforms cluster in identifiable places. Snowdonia in north Wales has the classic erosional suite: the corrie holding Llyn Idwal, the arete of Crib Goch and the glacial trough of Nant Ffrancon. Drumlin swarms in the Ribble and Eden valleys of northern England record ice-flow direction, and the Norber erratics in the Yorkshire Dales are dark Silurian gritstone boulders perched on pale limestone, dropped by ice from several kilometres away. Periglacial features such as ice-wedge polygons and pingos are seen today across the Canadian Arctic and Siberia and as relict forms in lowland Britain.
Past and present glaciation and its value
Pleistocene ice sheets shaped much of upland Britain (the Lake District, Snowdonia, the Scottish Highlands). Present glaciated and periglacial environments occur in high latitudes and high altitudes. They are valued for water storage (Alpine glaciers feed the Rhone and Rhine in summer), HEP, tourism (Chamonix and Banff attract millions), scientific research and unique ecosystems, and they hold meaning for indigenous and local communities such as the Inuit of the Canadian Arctic.
Threats and sustainable management
Glaciated environments are fragile: short growing seasons and slow recovery mean damage is long-lasting. Threats include climate change (retreating glaciers, melting permafrost releasing carbon, a synoptic link to the carbon cycle), tourism, resource extraction and HEP schemes. Sustainable management balances conservation with use through national parks, zoning, ecotourism and international agreements. Different players hold contrasting attitudes: conservation NGOs and indigenous communities prioritise protection, while energy firms and tour operators prioritise use, so futures for these landscapes are contested between development and preservation.
Examples in context
Example 1: the Lake District, England. A glaciated upland and UNESCO World Heritage Site, it shows both the value and the pressures: corries and ribbon lakes (Wastwater, Windermere) draw over 15 million visitors a year, bringing income but also footpath erosion, traffic and second-home pressure. The Lake District National Park Authority manages this through honeypot zoning, footpath repair and visitor management, balancing conservation with the local economy.
Example 2: Jakobshavn (Sermeq Kujalleq), Greenland. One of the fastest-flowing glaciers on Earth, it accelerated and thinned sharply through the 2000s, contributing meltwater to global sea-level rise. It illustrates how present glaciated environments are both indicators of and contributors to climate change, linking glaciation synoptically to climate change and the future.
Try this
Q1. Explain how a corrie is formed. [4 marks]
- Cue. Snow accumulates in a hollow, compacts to ice, rotates and erodes by plucking and abrasion to deepen an armchair-shaped basin with a steep back wall and a rock lip.
Q2. Suggest why glaciated environments are described as fragile. [4 marks]
- Cue. Short growing seasons, slow vegetation recovery, sensitive ecosystems and slow response to disturbance make damage long-lasting.
Exam-style practice questions
Practice questions written in the style of Pearson Edexcel exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Edexcel Paper 1 (style)12 marksAssess the extent to which glaciated landscapes are the product of glacial erosion rather than deposition.Show worked answer →
Erosional processes (plucking and abrasion, aided by freeze-thaw) carve the most dramatic upland landforms: corries, aretes, pyramidal peaks, glacial troughs, hanging valleys and roches moutonnees. In high-relief uplands such as Snowdonia these dominate the landscape.
Depositional landforms are equally important, especially in lowlands: moraines (terminal, lateral, medial, ground), drumlins, erratics and till plains, plus fluvioglacial features (eskers, kames, outwash plains) and periglacial features. A balanced judgement might argue erosion dominates in glaciated uplands while deposition dominates downstream and in lowlands, so the answer depends on the location and the scale considered. The strongest response links named processes to named landforms in a located example. AO1 supplies the process and landform knowledge; AO2 weighs erosion against deposition by location and scale to reach a judgement.
Edexcel 20186 marksExplain how glacial and fluvioglacial processes combine to produce contrasting depositional landforms.Show worked answer →
This is mostly AO1 with some AO2 linkage. Explain that glacial deposition drops material directly from ice, so till is unsorted, angular and unstratified, forming moraines and drumlins (streamlined by ice flow, with the steeper stoss end up-glacier). By contrast, fluvioglacial material is carried by meltwater, so it is sorted and rounded and often stratified, forming eskers (sinuous ridges from subglacial channels), kames and outwash (sandur) plains graded from coarse near the ice to fine downstream.
The contrast (the AO2 link) is the deposition mechanism: ice deposits chaotically when it melts, water deposits selectively by energy. Reward a located example such as till plains and drumlin swarms in the Eden Valley with outwash beyond a terminal moraine.
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Sources & how we know this
- Pearson Edexcel A-Level Geography (9GE0) specification — Pearson Edexcel (2016)