Question : The ______ are the low islands in the tropical oceans consisting of coral reefs surrounding a central depression.
Option 1: trenches
Option 2: atolls
Option 3: seamounts
Option 4: guyots
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Correct Answer: atolls
Solution : The correct answer is atolls .
An atoll is a lagoon partially surrounded by a chain of coral rims or a ring-shaped coral reef. An island's rim of atolls and lagoons protects the centre of the island. The atoll's corals are situated atop the rim of an extinct volcano known as a seamount, which has eroded into the ocean.
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