Q.

Atoll is a kind of –

A. sand-dune
B. lake
C. sandbar
D. inland sea
Answer» D. inland sea
Explanation: 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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