i) Fringing reef.
- A fringing reef consists of platform of coral built out from the coast. It is
usually flat or concave in appearance and its outer edge falls steeply to the
sea floor. It is formed by the coral polyps that start growing and extending
seawards faster, as conditions are more favourable than towards the shore; this is what
makes the reef to be higher on the sea ward edge. The higher seaward edge encloses a shallow
lagoon between it and the shore though this may disappear at low tide.
ii) Spit. Spit develops from sediments supplied mainly by longshore drift. As the long shore
drift maintains its straight course and comes across a headland; it disrupts its
smooth flow. It is made up sand or shingle or both. It is formed on shallow shore. It mostly
forms where the orientation of the coast changes. Materials are deposited along the
coast of by the longshore
drift.
-The deposition continues, extending into a bay/mouth of a river with one end attached to the land. Eventually, a ridge, with one end attached to the land and the other projecting
into the sea, is formed. This is a spit.