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Explain, with the aid of diagrams, the formation of any two landforms. - Leaving Cert Geography - Question 1(i) - 2006
Question 1(i)
Explain, with the aid of diagrams, the formation of any two landforms.
Worked Solution & Example Answer:Explain, with the aid of diagrams, the formation of any two landforms. - Leaving Cert Geography - Question 1(i) - 2006
Step 1
Landform 1: Sand Dunes
Answer
Sand dunes are formed by the wind's action in arid or semi-arid environments where sand is abundant.
- Formation Process: Wind erodes loose sand from the ground and transports it. The sand particles are then deposited in areas of lower wind velocity, creating mounds.
- Diagram: (Include a diagram depicting the wind direction, movement of sand, and the formation of a crescent-shaped dune).
- Aspects: - Migration: Dunes migrate over time as wind changes direction.
- Types: There are various types of dunes such as barchan, transverse, or parabolic, depending on wind direction and sand supply.
Step 2
Landform 2: Valleys
Answer
Valleys are formed primarily through erosion by rivers or glaciers over long periods.
- Formation Process: Rivers carve through rock and sediment, deepening and widening the valley. Glacial valleys form when glaciers move slowly down mountains, scraping the land beneath and creating U-shaped valleys.
- Diagram: (Include a diagram showing the cross-section of a river valley and a glacial valley).
- Aspects: - Types: Valleys can be V-shaped (formed by rivers) or U-shaped (formed by glaciers).
- Erosion and Sedimentation: Continuous erosion deepens the valley while deposition of sediments may occur at the river’s mouth.