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An atoll is formed from a coral reef and sometimes receding land or a volcanic structure.
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Atoll . An atoll is a type of coral reef, shaped like a ring, that surrounds a lagoon. .
An island of coral that encircles a lagoon partly or completely.
In most cases, the land area of an atoll is very small in comparison to the total area. Lifou (land area 1146 km²) is the largest raised coral atoll of the world. Lif…ou is a commune in the Loyalty Islands Province of New Caledonia, an overseas territory of France in the Pacific Ocean. It is situataed about 190 klms east of the New Caledonian mainland. It is the largest of the Loyalty Islands and is also the most heavily populated. For the source and more detailed information concerning this subject, click on the related links section indicated below.
A coral atoll is a large ring of coral that extends up to the ocean's surface and higher.
A volcanic island or underwater mountain forms via volcanic activity. This allows a surface near the water surface for corals to attach too. The corals form a ring around the …volcano.
an atoll is formed first as a reef that fringes a volcanic island. As the island sinks(after the volcanic activity has ceased and the crust has cooled, becoming denser), …the reef continues to build upward, eventually ending up as a ring-shaped structure
According to the Food Lover's Companion, atole (which is pronounced ah-TOH-leh) is "a very thick beverage that's popular in Mexico http://www.answers.com/topic/mexico-country-…north-americaMexicoand some parts of the American Southwest." For more information on atole at Answers.com, see the Related Link.
An atoll is formed first as a reef that fringes a volcanic island. As the island sinks (after the volcanic activity has ceased and the crust has cooled, becoming denser), th…e reef continues to build upward, eventually ending up as a ring-shaped structure.
An atoll is a ring-shaped coral reef that forms around a lagoon. Charles Darwin's theory of how atolls are formed as remnants of ocean volcanoes is generally considered fa…ct.
Small clusters of islands, generally they have little elevation above sea-level.
Atolls are formed first as a reef that fringes a volcanic island. The two largest atolls are Suvadiva in the Maldives Island and Kwajalein in the Marshall Islands.
They don't. Volcanoes rise from the bottom of the sea, and much later, coral might start living around the circular volcano and create an atoll eventually.
Mainly volcanic or uplifted coral massifs- not coral atoll in the usual sense
A long extinct oceanic volcano, when the volcano died the sea floorunder it slowly dropper causing the volcano to sink beneath theocean. As it sank a ring shaped coral reef fo…rmed around it andcontinued growing as the volcanic remnant and the reef on top of itcontinued sinking. Finally only the reef (and the islands on it)remained visible surrounding a lagoon. No sign of the volcano canbe seen on the surface, but sonar scans reveal its remnant as aseamount on the seafloor.