4c.4 costal conveyer belts

Question 1

Spits

Answer 1

Often found at a river estuaries - longshore drift transports
sediment into the river mouth, forming sandbank

Question 2

Spits

Answer 2

• Alluvium builds up behind the sandbank - a marsh

- Hurst Spit extends 1.4 miles into Solent/English Channel.

Question 3

Spits

Answer 3

-Most other spits will form at the mouths of rivers (which do
not allow sediment to reach other headland)
- Local wind or river currents curve the hook of the spit
recurved spits

Question 4

Bars

Answer 4

Often found in small bays - sand is pushed by long shore drift to
form a bank of sediment that joins the headlands together
to form a bar / barrier beach

Question 5

Bars

Answer 5

Former bay now cut off from sea to form a lagoon
(Slapton Ley).
- Key difference is lack of a high energy river - that would
otherwise cut through it - leaving a spit.

Question 6

Tombolo

Answer 6

Only form when a spit joins an offshore island.