Erosional landforms (Edexcel GCSE Geography A): Flashcards
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How long do coastal erosional landforms take to develop?
How long do coastal erosional landforms take to develop?
Hundreds to thousands of years
Define differential erosion
Define differential erosion
Different rock types resist erosion at different rates
What forms headlands?
What forms headlands?
Hard rocks jutting out into sea
What forms bays?
What forms bays?
Soft rocks eroded quickly, creating curved indentations
Examples of soft rocks
Examples of soft rocks
Sandstone, clay, sand
Examples of hard rocks
Examples of hard rocks
Chalk, limestone, granite
Cliffs from soft rocks
Cliffs from soft rocks
Gently sloping cliffs
Cliffs from hard rocks
Cliffs from hard rocks
Steep, near-vertical cliffs
Define hydraulic action
Define hydraulic action
Force of water thrown against rock
How do caves form arches?
How do caves form arches?
Caves on both sides of headland meet through it
How do arches form stacks?
How do arches form stacks?
Arch roof collapses, leaving isolated rock pillar
Define wave-cut platform
Define wave-cut platform
Flat rock area at cliff base, visible at low tide
Define undercutting
Define undercutting
Waves repeatedly attack bottom of cliffs
When are waves most powerful for forming platforms?
When are waves most powerful for forming platforms?
At high tide when they reach cliff base directly