To understand the landforms created by coastal erosion and deposition
Match up the pictures around the edge with each of the landforms below. Headland Bay Crack Arch Cave Stump Stack Wave cut platform
Landforms of coastal erosion 1) Headlands and Bays 2) Cliffs and Wave Cut Platforms 3) Caves, Arches, Stacks and Stumps
Headlands & Bays Headlands & Bays are landforms of coastal erosion. They occur where there is a resistant and less resistant rock. The diagram on the next slide explains their formation
Headlands and bays
An example of headlands and bays on the Dorset coastline… chalk clay limestone Swanage Bay
The waves attack the base of the cliff through the processes of abrasion, corrosion, hydraulic action and attrition.
Over time the cliff will be undercut and a wave-cut notch is formed.
Eventually the cliff becomes unstable and collapses. Further cliff retreat will form a wave-cut platform .
Wave-cut notches/platforms & cliffs Click on the link below to show how a wave cut platform is formed. http:// www.curriculumbits.com/proddetail.php?prod =geo0005
1. The waves erode FAULTS (cracks) in the headland.
2. The waves eventually erode through the headland to form an ARCH .
3. The arch becomes unsupported and collapses to form a STACK .
4. A STUMP is formed from the collapsed stack.
Caves, arches, stacks and stumps
A crack in the cliff is eroded by erosion processes such as hydraulic action and solution Over time the erosion causes the cave to break through the headland creating an arch. Eventually the top of the arch will collapse due to gravity and a lack of support. This creates a stack. A stack becomes unstable as erosion continues at the base. It eventually collapses and creates a stump 1 2 3 4
Click on the web addresses below for different resources on coastal stacks.