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Outline the process of sub-aerial weathering in the development of coastal landscapes - AQA - A-Level Geography - Question 3 - 2020 - Paper 1
Question 3
Outline the process of sub-aerial weathering in the development of coastal landscapes. [4 marks]
Worked Solution & Example Answer:Outline the process of sub-aerial weathering in the development of coastal landscapes - AQA - A-Level Geography - Question 3 - 2020 - Paper 1
Step 1
Sub-aerial weathering involves the action of rainwater and insolation upon landforms in the coastal landscape.
Answer
Sub-aerial weathering plays a crucial role in shaping coastal landscapes by breaking down rock formations. This process begins with the physical and chemical weathering of rocks due to environmental factors.
Step 2
Here material is broken in situ; rocks are weakened and can contribute to sudden large-scale movements.
Answer
As rocks weather in place, they become more susceptible to erosion. For example, freeze-thaw cycles can cause fractures in rocks, leading to their eventual breakdown and contributing to landslides or rockfalls.
Step 3
Chemical weathering occurs when weak carbonic acid in rainwater attacks limestone cliffs.
Answer
This chemical connection is significant, especially in coastal regions where limestone is prevalent. The formation of karst landscapes is a direct result of this weathering process, ultimately affecting the coastline.
Step 4
Biological weathering involves the burrowing of plants and animals into the rock's surface.
Answer
Organisms like roots of plants can physically penetrate rocks, while animals can further weaken the rock structure. This biological action enhances the breakdown of the rock material, facilitating further erosion by water.