How do erosion and deposition create distinctive coastal landforms?
The formation of headlands and bays, caves, arches, stacks and stumps by erosion, and beaches and spits by deposition (AO1, AO2).
A focused CCEA GCSE Geography guide to coastal landforms. Covers how headlands, bays, caves, arches, stacks and stumps form by erosion, and how beaches and spits form by deposition, linked to the processes that create them.
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What this dot point is asking
CCEA wants you to explain the formation of the main coastal landforms and to link each to the processes that create it. The two groups are erosion landforms (headlands and bays, then caves, arches, stacks and stumps) and deposition landforms (beaches and spits). As with rivers, these are classic "with the aid of a diagram, explain the formation of..." questions, so a clear, sequenced explanation supported by a labelled diagram is what scores.
Headlands and bays (erosion)
They form on a discordant coastline, where bands of hard and soft rock meet the sea:
- The softer rock (such as clay) is eroded faster, forming a bay, which often has a beach.
- The harder rock (such as limestone or chalk) is more resistant and is left jutting out as a headland.
- Wave energy then concentrates on the exposed headlands, where the next set of landforms develops.
Caves, arches, stacks and stumps (erosion)
On a headland, erosion attacks a line of weakness such as a crack or joint, producing a clear sequence:
- Crack. Hydraulic action and abrasion widen a crack or joint in the rock.
- Cave. Continued erosion deepens the crack into a cave.
- Arch. Erosion cuts right through the headland to join two caves or break through, forming an arch.
- Stack. The roof of the arch is undercut, becomes unsupported and collapses, leaving an isolated pillar called a stack.
- Stump. Further erosion wears the stack down to a low stump, often covered at high tide.
Beaches and spits (deposition)
Deposition landforms form where waves lose energy and drop their load.
- Beaches form in sheltered bays, where constructive waves deposit sand and shingle. Sandy beaches are gently sloping; shingle beaches are steeper.
- Spits form where longshore drift carries sediment along the coast and the coastline changes direction (at a river mouth or bay). The sediment is deposited in the sheltered, deeper water and builds up into a long, narrow ridge joined to the land at one end. A change in wind can curve the end into a recurved hook, and salt marsh often develops in the sheltered water behind it.
Worked example: from headland to stump
Common mistakes
Examples in context
Example 1. Why headlands do not last forever. A headland concentrates wave energy, so although it is made of harder rock, it is attacked most fiercely and slowly retreats through the cave, arch, stack and stump sequence. Over a long time the coastline straightens as headlands are worn back and bays fill with deposited sediment. Recognising that the coast is constantly changing, not fixed, is the kind of process thinking CCEA rewards.
Example 2. The spit and its salt marsh. Behind a spit, the water is sheltered from waves, so fine mud and silt settle and salt-tolerant plants colonise to form a salt marsh, a valuable habitat. This shows how one depositional landform creates a distinct environment, linking physical processes to ecosystems and to the management issues that arise when people want to use or protect such coasts.
Try this
Q1. What is the difference between a headland and a bay? [2 marks]
- Cue. A headland is hard rock jutting out; a bay is softer rock eroded faster into a curved indentation.
Q2. Put the erosion landforms in order. [2 marks]
- Cue. Crack, cave, arch, stack, stump.
Q3. What transport process builds a spit? [1 mark]
- Cue. Longshore drift, moving sediment along the coast.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA Unit 1 (style)7 marksWith the aid of a diagram, explain the formation of a stack.Show worked answer →
Seven marks for a sequenced explanation from headland to stack.
Erosion concentrates on a headland, attacking a line of weakness such as a crack or joint.
Hydraulic action and abrasion widen the crack into a cave.
Continued erosion cuts through the headland to form an arch.
The roof of the arch is undercut and becomes unsupported.
The roof collapses, leaving an isolated pillar of rock called a stack.
Further erosion wears the stack down to a stump. Markers reward the sequence crack, cave, arch, stack (and stump), with named processes and ideally a diagram.
CCEA Unit 1 (style)6 marksExplain how a spit is formed.Show worked answer →
Six marks for a sequenced explanation linked to longshore drift.
Longshore drift moves sediment along the coast in the direction of the prevailing wind.
Where the coastline changes direction, for example at a river mouth or bay, the sediment is deposited in the deeper, sheltered water.
The deposited material builds up over time to form a long, narrow ridge of sand or shingle joined to the land at one end, called a spit.
A change in wind direction can curve the end of the spit into a hook (a recurved end).
Salt marsh often develops in the sheltered water behind the spit.
Markers reward longshore drift, deposition where the coast changes direction, the build-up of the ridge, and the recurved end or salt marsh.
Related dot points
- Constructive and destructive waves, the processes of marine erosion, transportation by longshore drift, and deposition (AO1).
A focused CCEA GCSE Geography guide to coastal processes. Covers constructive and destructive waves, the four processes of marine erosion, transportation by longshore drift, and why deposition occurs, as the foundation for coastal landforms.
- The causes and effects of coastal flooding, the threat of rising sea levels, and the conflicting ways people use and value the coast (AO1, AO2).
A focused CCEA GCSE Geography guide to coastal flooding and human pressures on the coast. Covers the physical causes of coastal flooding including storm surges and rising sea levels, the social, economic and environmental effects, and the competing demands people place on coastlines.
- Hard and soft engineering strategies for managing the coast, their costs and benefits, and how to evaluate the most sustainable approach (AO2, AO3).
A focused CCEA GCSE Geography guide to coastal management. Covers hard engineering such as sea walls, groynes and rock armour, soft engineering such as beach nourishment, dune regeneration and managed retreat, and how to evaluate the most sustainable approach.
- A case study of coastal erosion and management on a named coastline, its causes, the strategies used, and their effects (AO1, AO2).
A focused CCEA GCSE Geography case study of coastal erosion and management, using the Holderness coast as a worked example. Covers why the coast erodes so fast, the management strategies used, their effects downdrift, and how to deploy a case study in an exam answer.
- The formation of waterfalls and gorges, meanders and ox-bow lakes, and floodplains and levees, linked to the processes that make them (AO1, AO2).
A focused CCEA GCSE Geography guide to fluvial landforms. Covers how waterfalls and gorges form by erosion in the upper course, how meanders and ox-bow lakes form by erosion and deposition in the middle course, and how floodplains and levees form by deposition in the lower course.
Sources & how we know this
- CCEA GCSE Geography specification — CCEA (2017)
- CCEA GCSE Geography (2017) Unit 1 past papers and mark schemes — CCEA (2024)