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.
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.
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Answer
This process begins when rainwater seeps into cracks and pores in rocks. Over time, the constant exposure to moisture contributes to the weakening of these rocks, making them more susceptible to further weathering.
Step 2
Here material is broken in situ, rocks are weakened and can contribute to sudden large-scale movements.
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Answer
The destabilized rocks may then slide or collapse, leading to landforms such as cliffs being reshaped and eroded, influencing the coastal landscape significantly.
Step 3
Chemical weathering occurs when weak carbonic acid in rainwater attacks limestone cliffs.
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This chemical process breaks down calcite in limestone, leading to features such as sinkholes and karst landscapes. Over time, this significantly alters the topography of coastal regions.
Step 4
Biological weathering refers to the burrowing of plants and animals into the rock material.
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Roots of vegetation and activities of burrowing animals can further weaken and break down the rock, facilitating erosion and contributing to the gradual transforming of coastal environments.
