coastal systems -depositional landforms (barrier beaches and islands)

Question 1

where do barrier beaches form?

Answer 1

.where a spit extends across a bay or joins two headlands together
.only form where there is no current flowing off the land

Question 2

what can form behind a barrier beach?

Answer 2

.a lagoon forms which is usually shallow and marshy and in tropical locations mangrove swamps can form
.over time the lagoons may become full of silt and eventually dry up

Question 3

what is an example of a barrier beach?

Answer 3

.slapton ley

Question 4

on the south coast of England the original gravel that initially formed barrier beaches may have come from where?

Answer 4

.glaciers that melted after the last Ice Age were deposited on the coast by constructive waves, forming the barrier beach

Question 5

what is a barrier island?

Answer 5

.series of depositional islands separated by inlets and running parallel to the shore but detached from it

Question 6

what are the characteristics of a barrier island?

Answer 6

.usually made of sand or shingle .long and narrow and become vegetated as they get older as vegetation succession occurs

Question 7

what is an example of a barrier island?

Answer 7

.West Frisian islands off the coast of the netherlands

Question 8

how are barrier islands formed?

Answer 8

.thought that they are formed of sediment deposited when glaciers melted 18,000 years ago at the end of the last Ice Age
.it’s probable that currents deposited this material in barrier beaches and that the melting ice meant that sea levels rose leaving these beaches separated from the mainland

Question 9

where are barrier island usually found?

Answer 9

.low tidal ranges and gently sloping offshore coastlines