Summary
The formation of coastal landforms is influenced by the orientation and type of rocks along the coast, leading to discordant or concordant coastlines.
- Hard Rocks — Rocks like granite, limestone, and chalk that resist erosion. Example: Form cliffs and headlands due to their durability against wave action.
- Soft Rocks — Rocks such as clay, sand, and shale that erode easily. Example: Form bays and coves as they wear away quickly under wave attack.
- Discordant Coastline — A coastline where rock bands run perpendicular to the shore. Example: Creates headlands and bays through differential erosion.
- Concordant Coastline — A coastline where rock bands run parallel to the shore. Example: Forms coves when the outer hard rock is breached.
- Differential Erosion — The process where different rock types erode at different rates. Example: Hard rocks resist erosion while soft rocks erode quickly.
Exam Tips
Key Definitions to Remember
- Discordant Coastline
- Concordant Coastline
- Differential Erosion
- Headland
- Bay
- Cove
Common Confusions
- Confusing headlands with soft rock formations
- Assuming concordant coastlines remain smooth indefinitely
Typical Exam Questions
- What is a discordant coastline? A coastline where rock bands run perpendicular to the shore, creating headlands and bays.
- How do coves form on a concordant coastline? Coves form when waves breach the outer hard rock, allowing erosion of the softer rock behind.
- What role does differential erosion play in coastal formation? It causes different rock types to erode at different rates, shaping the coastline.
What Examiners Usually Test
- Understanding of rock orientation and its impact on coastal landforms
- Ability to explain differential erosion and its effects
- Knowledge of specific landforms like headlands, bays, and coves