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Explain, with the aid of diagrams, the formation of any two landforms that you have studied - Leaving Cert Geography - Question C - 2019
Question C
Explain, with the aid of diagrams, the formation of any two landforms that you have studied. OR Describe and explain any two processes of mass movement.
Worked Solution & Example Answer:Explain, with the aid of diagrams, the formation of any two landforms that you have studied - Leaving Cert Geography - Question C - 2019
Step 1
Formation of Landform 1: Sand Dunes
Answer
Sand dunes are formed primarily through the processes of wind erosion and deposition. As wind moves over loose, dry sand, it picks up sand particles, eroding the landscape. When the wind speed decreases, it loses its ability to carry the sand, leading to deposition.
Diagram
A diagram illustrating a cross-section of sand dunes can be included here to show the typical shape and orientation of dunes relative to wind direction.
Aspects of Sand Dunes
- Shape and Structure: Sand dunes typically have a gentle slope on the windward side and a steep slope on the leeward side.
- Types of Dunes: Dunes can be classified into various types such as crescentic, linear, and star dunes, each characterized by their unique formation process and shapes.
Step 2
Formation of Landform 2: Glacial Valleys
Answer
Glacial valleys, also known as U-shaped valleys, are formed through the processes of glacial erosion. When a glacier moves through a mountainous area, it erodes the surrounding rocks and soil, creating a characteristic U-shape.
Diagram
A diagram depicting the cross-section of a glacial valley with sweeping sides and a flat floor can serve to illustrate this process effectively.
Aspects of Glacial Valleys
- Erosion Features: Features include roches moutonnées and fjords, formed due to the varying rates of erosion within the valley.
- Sediment Deposits: Glacial meltwater often leads to the deposition of till, which can form various sedimentary features at the valley's end.