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Assess the relative importance of weathering and erosion in the development of coastal landscapes. - AQA - A-Level Geography - Question 3 - 2018 - Paper 1
Question 3
Assess the relative importance of weathering and erosion in the development of coastal landscapes.
Worked Solution & Example Answer:Assess the relative importance of weathering and erosion in the development of coastal landscapes. - AQA - A-Level Geography - Question 3 - 2018 - Paper 1
Step 1
Assess the relative importance of weathering in coastal landscapes.
Answer
Weathering is a key process in the development of coastal landscapes, influencing rock stability and altering terrain features over time. Physical weathering, such as freeze-thaw cycles, leads to the breakdown of rocks along coastlines, while chemical weathering can change the composition of rocks, making them more susceptible to erosion. Understanding local factors, such as climate and geological composition, is crucial here. For example, in temperate coastal regions, chemical weathering may be significant due to the presence of moisture and temperature fluctuations.
Step 2
Assess the relative importance of erosion in coastal landscapes.
Answer
Erosion plays a dominant role in shaping coastal landscapes through various mechanisms including hydraulic action, abrasion, and corrosion. Wave action erodes cliffs and transports sediment, creating features such as wave-cut platforms and coastal arches. The impact of erosion can vary based on the geographical features of a coastline; for instance, softer rock formations erode more quickly than harder ones. The interaction between wave energy and geological materials is vital in determining how quickly and effectively erosion occurs.
Step 3
Evaluate the relative importance of weathering and erosion.
Answer
While both weathering and erosion are essential in shaping coastal landscapes, erosion is often considered the more influential process. Weathering prepares rocks for erosion, but it is the dynamic forces of waves and currents that actively reshapes the coastline. In some regions, like those with steep cliffs, erosion can drastically alter the landscape, overshadowing the role of weathering. However, in vulnerable areas such as soft sedimentary coasts, both processes work together, highlighting their interdependence and collective importance in coastal landscape development.