How are lagoons formed?

Answer

Any body of salt water or brackish water that is a shallow separation from the rest of the sea is considered a lagoon, and they form when sand banks or reefs build up along shallow waters near the coast or when coral reefs grow on central islands that are sinking. Estuaries, or fresh water streams, feed the lagoons as they grow.

The word "lagoon" dates back to 1769, and its first use refers to the stretch of salt water dotted with islands along the edge of Venice, which has the Lido's barrier beaches protecting it from the stormy surges from the Adriatic Sea. The Italian word "laguna," which is based on the Latin word "lacuna," or empty space, was the inspiration for this English term. Some lagoons have taken on other names, such as North Carolina's Albemarle Sounds or the Banana River in Florida, but they are still lagoons.

When a lagoon forms as part of the ecosystem of a coral reef, the term means the same thing as "back reef," which is the technical term that scientists use. Whether the lagoon is part of a coral system or not, its shallow waters make it extremely sensitive to changes in the environment.

Q&A Related to "How are lagoons formed?"
wen the sea washes silt and sand to form a spit and that joins up to another piece od land coming out from the coast and therefore seperates the sea from the lagoon.
http://wiki.answers.com/Q/How_is_a_lagoon_formed
A more useful answer: When a river flows into the sea, the change of speed causes the sediment that is flowing along with the water to drop out. This builds up the sand and if the
http://answers.yahoo.com/question/index?qid=201010...
Lagoon ,huh it must be a lake at the beginning then the output way and the input way have been cut out ,then days gone by ,the salt concentration raises sharply
http://www.blurtit.com/q8225691.html
The lagoon water is fresh not salt. Because the atoll is a completely closed ring, the water in the lagoon is fresh, not salty sea water. It is not drinkable, being brackish, so the
http://www.funtrivia.com/en/Geography/Tokelau-2045...
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