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GS Geography Physical Geography of World
Q.

Atoll is a kind of:
Explanation:

ANS. (D) 
Atoll is a coral island (or islands) that encircle a lagoon partially or completely. It is formed when the island sinks below the sea, and the barrier reef becomes an atoll enclosing an open lagoon. So in a way it is a kind of inland sea which is a shallow sea that covers central areas of continents during periods of high sea level.

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