Multiple choice

The coral reef which is circular or elliptical in shape an enclose a lagoon is called

  1. A barrier

  2. An atoll

  3. A coral dune

  4. A coral fringe
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An atoll is a ring-shaped coral reef, island, or series of islets that surrounds a body of water called a lagoon. They typically form when a coral reef grows around a volcanic island that eventually subsides or sinks beneath the ocean surface. Fringing reefs and barrier reefs are different structures that do not fully enclose a central lagoon in this circular fashion.

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