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Examine the role of the processes of erosion on the formation of one fluvial landform or one coastal landform or one glacial landform that you have studied. - Leaving Cert Geography - Question i - 2020
Question i
Examine the role of the processes of erosion on the formation of one fluvial landform or one coastal landform or one glacial landform that you have studied.
Worked Solution & Example Answer:Examine the role of the processes of erosion on the formation of one fluvial landform or one coastal landform or one glacial landform that you have studied. - Leaving Cert Geography - Question i - 2020
Step 1
Processes of erosion named
Answer
In this examination, I will focus on the processes of erosion, specifically hydraulic action and abrasion, as they play a crucial role in the formation of fluvial landforms. Hydraulic action refers to the force of moving water eroding the banks and bed of rivers, while abrasion involves the wearing away of the river channel by sediments carried by the water.
Step 2
Step 3
Examination
Answer
The processes of hydraulic action and abrasion greatly influence the formation of meanders. As a river flows, the outer bank experiences greater velocity and erosion due to faster-moving water, leading to undercutting and the eventual retreat of the bank. Conversely, the inner bank, where the flow is slower, allows for sediment deposition, resulting in the accumulation of materials that form point bars. Over time, this process enhances the curvature of the river, leading to the formation of the meandering pattern.
Additionally, a labelled diagram illustrating a meander can clarify the processes involved. This diagram should indicate the outer bank (undergoing erosion) and the inner bank (where deposition occurs). Furthermore, it is important to note that the continuous action of these erosional processes can result in significant changes to the river's course, gradually increasing the meander's size and prominence.