atoll (Q42523)
ring-shaped coral reef, generally formed over a former oceanic volcano, frequently with small emerging islands (motus) over the rim, often enclosing a central lagoon possibly still containing one or a few emerging elevated islands
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aliases coral atoll
description ring-shaped coral reef, generally formed over a former oceanic volcano, frequently with small emerging islands (motus) over the rim, often enclosing a central lagoon possibly still containing one or a few emerging elevated islands

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