Beaches are made up from ___ material, transported from elsewhere
eroded
1 of 18
the material has been d___ by the sea
deposited
2 of 18
what must be true for deposition to occur?
waves must have limited energy to drop material
3 of 18
what kind of waves form beaches?
constructive waves (deposit material)
4 of 18
describe strength of swash compared to the backwash in a constructive wave
swash is stronger then backwash as more material is deposited to form beach then is taken back by backwash
5 of 18
Sandy beaches are usually found in bays. why?
water is shallow and the waves have less energy
6 of 18
Where do pebble beaches often form?
where cliffs are being eroded, where waves have more energy
7 of 18
what is a spit?
an extended stretch of sand/ shingle extending out into the sea from the land.
8 of 18
when do spits occur? (conditions?)
when the landscape changes shape, or there's a river mouth (sepating the land)
9 of 18
when forming a spit, sediment is carried by ___ ___
longshore drift.
10 of 18
When there is a change in the shape of the coastline, ___ occurs
deposition
11 of 18
A long thin ridge of material is deposited. this a ___
spit
12 of 18
describe what will happen to spit if the direction of wind changes?
the spit will bend to have a hooked end
13 of 18
can waves get past a spit?
no
14 of 18
what does this mean for the water behind a spit?
it's very sheltered - it losses energy, depositing all carried material, forming a salt marsh
15 of 18
describe what the landform of a bar is
when a spit does not curve, and it goes straight across the gap (change in shape) of land, joining tw headlands together. this is the formation of a bar
16 of 18
how can this form a lagoon?
shallow lakes can be trapped behind the spit
17 of 18
Lagoons do not last forever. explain why
they may be filled up with sediment
18 of 18
Other cards in this set
Card 2
Front
the material has been d___ by the sea
Back
deposited
Card 3
Front
what must be true for deposition to occur?
Back
Card 4
Front
what kind of waves form beaches?
Back
Card 5
Front
describe strength of swash compared to the backwash in a constructive wave
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