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You are here: home > geotopics > coasts > erosional landforms

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Coastal Erosion

Erosional Lanforms
Cliff Recession
Landforms overview
Bays and headlands
Erosion Of A Headland

Coastal Deposition
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Transportation

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Case Study
The Holderness Coast

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Erosional Landforms

 
 
Online Activities
[Online activities]: n Activities related to this topic
Coastal Erosion - Match up game
Waves - Match up game
Coastal Deposition - Match up game
Coasts Interactive revision diagram
Podcast
[Podcast]: n Audio file for playback on mobile devices and personal computers
Waves and Coastal Erosion 
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Cliff Recession

Erosion is greatest when waves break at the foot of a cliff. This causes erosion at the base of the cliff. This creates a wave-cut notch in the base of the cliff. As the notch increases in size the weight of the cliffs above become too much and the cliff collapses. This material will provide temporary protection for the cliff behind. However, once it has been removed by the sea this process will occur again. Where cliffs are made of more resistant material, wave cut platforms will be created.

Landforms overview

The video above covers the formation of erosional landforms. If you cannot view the video please ensure you have the latest version of Windows Media Player installed on your computer. You can download it here. Alternatively download the original file here.

Bays and headlands

Headlands form along coastlines in which bands of soft and hard rock outcrop at right angles to the coastline (see image below). Due to the different nature of the rock erosion occurs at different rates. Less resistant rock (e.g. boulder clay) erodes more rapidly than less resistant rock (e.g. chalk).

 
   
The image below shows the landforms that result from the different rates of erosion.  
Image of bays and headlands  
   


Erosion of a headland
A headland is an area of hard rock which sticks out into the sea. Headlands form in areas of alternating hard and soft rock. Where the soft rock erodes bays are formed either side of the headland. As the headland becomes more exposed to the wind and waves the rate of its erosion increases. When headlands erode they create distinct features such as caves, arches, stacks and stumps.

The diagram below shows the sequence in the erosion of a headland.

Stage 1

Waves attack a weakness in the headland.

Stage 2

A cave is formed.

Stage 3

Eventually the cave erodes through the headland to form an arch.

Stage 4

The roof of the arch collapses leaving a column of rock called a stack.

Stage 5

The stack collapses leaving a stump.

     
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