What is a spit and where do they occur?
Spit = an area of sand or shingle which one end joined to land whilst the other either extends to sea or grows across a river estuary.
They only occur in places where:
- Longshore drift moves large amounts of material along beach
- Sea is quite shallow
- Sudden change in direction of coastline
How long do they grow for?
They grow until:
- water's too deep for material to build up
- water current in river too strong & material will be removed faster than it can build up.