3) The Dorset Coast Flashcards
What are the white cliffs made from?
Chalk
How is an arch formed?
When a notch expands into a cave into an arch
example of a bay in dorset coast
Swanage bay
example of a headland
the Foreland
example of an arch
durdle door
example of a stack
old harry rocks
example of a stump
old harry’s wife
how is the roof of an arch eroded?
weathering (freeze thaw, chemical and biological)
what is durdle door made from?
limestone
Example of a spit?
Chesil beach
How was Chesil beach (a spit) formed?
Longshore drift
Main form of mechanical weathering
Salt weathering, especially in summer
Why is freeze thaw weathering less common?
Winters are mild
How does its location influence erosion?
Exposed to prevailing wind, which brings storms
Storms bring destructive waves which increase rate of erosion
What is Lulworth Cove made from which makes it easily eroded?
Clay - a soft rock
3 ways of preserving the coastline
Groynes, sea walls, beach replenishment
Where have groynes been erected and why?
Swanage beach to stop the loss of beach material
How much did beach replenishment of Swanage beach cost?
£5 million
How is quarrying shaping the landscape?
Lots of quarrying exposes rock to chemical weathering and erosion
What limestone is Lulworth cove made from?
Purbeck limestone
Example of a tombolo
Chesil beach
What two places does Chesil Beach connect?
Isle of Purbeck to the mainland
Example of a depositional landform
Mudeford spit
How was mudeford spit formed?
Longshore drift of material from Bournemouth beach
What are berms?
A series of ridges marking the lower tides
Main form of mechanical weathering?
Salt weathering
Reasons to protect the Dorset Coast 3
Over a million toursists per year
Site of special scientific interest (SSSI)
Erosion is increasing
Ways to protect the beach 4
Beach replenishment
Long groyne
Gabions
Ironstone doggers
