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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.

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14y ago
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14y ago

An island of coral that encircles a lagoon partly or completely.

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14y ago

An island consisting of a circular coral reef surrounding a lagoon

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9y ago

An atoll is an island formed by a ring-shaped coral reef encircling a lagoon. Atoll's are mostly found in tropical waters because they require coral reef building.

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14y ago

Small clusters of islands, generally they have little elevation above sea-level.

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14y ago

An example of an atoll is Bikini Atoll

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polo g Capalot Forev...

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1y ago
who was most involved in the scramble for africa

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14y ago

bikini atoll

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11y ago

coral

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8y ago

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Q: Give you an example of an atoll?
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