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Question

A coral island in a central shallow lake is known as

A
Coral reef
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B
Atoll
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C
Corallite
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D
Diatomaceous sheath
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Solution

The correct option is C Atoll
Coral reefs are of three types fringing, barrier and atoll. In atoll, a ring like a reef occurs around a lagoon, enclosing a shallow lake. Corallite refers to the cup like the skeleton of a single coral polyp. The sedimentary deposits formed from the fossil remains of diatoms are known as diatomaceous earth.
Thus, the correct answer is option B.

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