Barrier Beachs + Islands Flashcards
Where do they form
Where a spit extends across a bay or joins two headlands together
Original barrier beaches sediment deposits from what (2+)
Gravel deposited in the English Channel when glaciers melted after the last ice age
Deposited on coast by constructive waves = barrier beaches
What does ice age and gravel etc show (2)
Landforms can be the product of a number of processes over a range of timescales
Where can barrier beaches be formed
ONLY where there is no current flowing of the land
What can also form behind the bar (3)
Lagoons = shallow and marshy
Tropical location = mangrove swamps
Overtime = lagoon fill with slit + dry up
Example specific in enlarged of barrier beach
Slapton Ley - barrier beach in Devon
Where do they form - islands
When barrier beaches become separate from mainland
What - island (3+)
Made up of sand or shingle
Narrow + Long = up to 100 miles
Become vegetated as they get older = veg succession occurs
What sediment is thought to have formed them - island
From sediment originally deposited when glaciers melted 18000 years ago at end of last ice age
How is sediment deposited - barrier islands (2)
Currents deposited the material (glacial) in barrier beaches
Melting ice = sea levels rise = beaches separate from mainland
Example of barrier islands
The West Frisian islands in the Netherlands
