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What is the largest coral atoll in the world?

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The largest coral atoll in the world is the Kwajalein Atoll.
The largest atoll in land area is Christmas Island.
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What is the largest chain of coral in the world?

The largest chain of coral in the world is the Great Barrier Reef.  Running roughly parallel to the coast of Queensland, Australia, it  is about 2300 km in length, and consi

How is a coral Atoll formed?

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

How do coral atolls form volcanoes?

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.

Why was coral atoll chosen for the nuclear tests?

The U.S. used the pacific atolls because they were isolated from  large population centers and because the Marshal Islands (where  many of these atolls were) were entirely u