Coasts

Question 1

How is a spit formed?

Answer 1

Sediment is carried by longshore drift
When there’s a change in the shape of the coastline,deposition occurs and a long thin ridge of material is deposited.
A hooked end can form if there’s a change in wind direction
The water behind the spit is very sheltered because waves can’t get there so silts are deposited there to form salt marshes or mud flats

Question 2

How are bars formed?

Answer 2

A spit can grow across a bay and joins two headlands together.
They can trap shallow lakes behind a bar which are called lagoons which may end up being filled with sediment