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Explain, with the aid of diagrams, the formation of any two landforms - Leaving Cert Geography - Question 2B - 2020
Question 2B
Explain, with the aid of diagrams, the formation of any two landforms. 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 - Leaving Cert Geography - Question 2B - 2020
Step 1
Explain, with the aid of diagrams, the formation of any two landforms.
Answer
Landform 1: River Valley
Diagram Description
A cross-section diagram illustrating a V-shaped valley formed by river erosion. Include features such as the riverbed, valley sides, and surrounding landscape.
Formation Explanation
The formation of a river valley occurs through a process of erosion. As water flows over land, it cuts into the soil and rocks, gradually deepening and widening the valley. This process results in a V-shaped profile due to the erosive force of the river, particularly during heavy rainfall.
Landform 2: Sand Dune
Diagram Description
A diagram showing a transversely oriented sand dune, highlighting aspects such as wind direction, the steep windward and gentle leeward slopes.
Formation Explanation
The formation of sand dunes is driven by the process of aeolian transport. Wind transports loose sand particles, which accumulate in certain areas, forming dunes. The shape and orientation of the dune depend on wind direction and intensity, where the windward side is steep, and the leeward side is more gradual.
Step 2
Describe and explain any two processes of mass movement.
Answer
Process 1: Landslide
Process Stated
A landslide occurs when a mass of rock and soil moves down a slope.
Description / Explanation
Landslides commonly occur due to factors like heavy rainfall or earthquakes. The saturation of soil from rain increases its weight, eventually leading to failure and causing materials to slide down the slope. This rapid mass movement can result in significant destruction of landscapes.
Step 3
Describe and explain any two processes of mass movement.
Answer
Process 2: Soil Creep
Process Stated
Soil creep is a slow, gradual movement of soil down a slope.
Description / Explanation
Soil creep occurs over long periods as the weight of soil particles, combined with the effects of gravity, causes them to slowly move downwards. This often results in visible features, such as leaning trees or cracked pavements, in areas where soil creep is prevalent.