Eduqas A-Level Geography A110QS
Coastal LandscapesLandscape
Glaciated LandscapesLandscape
Changing Places
Water and Carbon Cycles
Global Migration
Global Governance of the Oceans
Tectonic Hazards
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
Geographical Skills
Coastal Landscapes
Lithology and structural geology at the coast
- 2 things to know
- Component 1 Section A
Overview
Why the chalk of Flamborough Head erodes faster than granite, dip of a rock stratum and importance of joints in coastal erosion.
What you need to know
Answer each one before you reveal it.
Why does granite form dramatic cliffs at Land's End in Cornwall?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Define lithology.
Model answer
Lithology means the physical and chemical characteristics of a rock. Mineral composition, hardness, permeability and solubility are all part of it.
- 2
Why does granite form dramatic cliffs at Land's End in Cornwall?
Model answer
Granite is a crystalline igneous rock with interlocking minerals and few weaknesses. Erosion is slow, so the cliffs remain high and near vertical.
- 3
Explain why the chalk of Flamborough Head erodes faster than granite.
Model answer
Chalk is a soft, well jointed sedimentary rock that dissolves slowly in weakly acidic sea water. Hydraulic action exploits the joints and bedding planes rapidly.
- 4
How does the solubility of limestone affect coastal erosion?
Model answer
Limestone is calcium carbonate and reacts with acids dissolved in sea water and rainwater. Corrosion widens joints and produces caves and solution hollows.
- 5
Why do the boulder clay cliffs of Holderness retreat so rapidly?
Model answer
Boulder clay is unconsolidated glacial till with no cementing between its particles. Waves remove the debris quickly and the saturated clay slumps from above.
- 6
Define the dip of a rock stratum.
Model answer
Dip is the angle at which a bed of rock is tilted from the horizontal. The direction of dip strongly controls the stability of a cliff.
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