WJEC A-Level Geography 601-8455-3
Coastal Landscapes
Glaciated Landscapes
Tectonic Hazards
Changing Places
Water and Carbon Cycles
Global Migration
Global Governance of the Oceans
EcosystemsContemporary theme
Economic Growth and Challenge: IndiaContemporary theme
Economic Growth and Challenge: ChinaContemporary theme
Development in an African ContextContemporary theme
Energy Challenges and DilemmasContemporary theme
Weather and ClimateContemporary theme
Fieldwork and Geographical Skills
Coastal Landscapes
Lithology and structural geology at the coast
- 2 things to know
- AS Unit 1
Overview
How mineral composition affects the rate of cliff retreat, structural geology in a coastal context and dip of a rock stratum.
What you need to know
Answer each one before you reveal it.
Why does granite form more resistant coastal cliffs than clay?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Define lithology.
Model answer
Lithology is the physical and chemical character of a rock, including its mineral composition, hardness and how soluble it is.
- 2
Why does granite form more resistant coastal cliffs than clay?
Model answer
Granite is crystalline, hard and has few open joints, whereas clay is soft, unconsolidated and slumps readily once wetted.
- 3
Which coastal rock is most vulnerable to solution, and why?
Model answer
Limestone, because its calcium carbonate reacts with the weak carbonic acid in rainwater and seawater and is dissolved away.
- 4
Explain how mineral composition affects the rate of cliff retreat.
Model answer
Rocks whose minerals resist chemical attack and bind tightly together lose material slowly, while rocks with soluble or easily weathered minerals break down and retreat quickly.
- 5
Define structural geology in a coastal context.
Model answer
Structural geology is the arrangement of the rock, including its bedding, the direction and angle of dip, its joints, and any folding or faulting.
- 6
What is the dip of a rock stratum?
Model answer
The dip is the angle at which a bed of rock is inclined from the horizontal, together with the direction of that inclination.
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