A spit is formed when...
Material is transported through longshore drift until the coastline changes, to a river estuary, for example, slowing down the speed of longshore drft causing a build up of material.
The build up of material is callewd a spit, and behind this a salt marsh is formed.
E.G. Hurst Castle
A bar is formed when...
The spit extends over a bay isolating the two bodies of water and creating a lagoon on one side with the sea on the other.
E.G. Slapton Sands, Devon
A tombolo is formed when...
a spit grows accross a bay to reach an island.
E.G. St michaels mount, Cornwall
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