Multiple choice

What is the name given to an almost circular coral reef inside which there is a lagoon?

  1. Fringing reef

  2. Barrier reef

  3. Atoll

  4. Isthmus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An atoll is a ring-shaped coral reef that encloses or nearly encloses a lagoon. Atolls form when coral reefs grow around a volcanic island that eventually sinks, leaving the reef as a circular structure. Fringing reefs grow directly from shore, while barrier reefs are separated from land by deeper water.

Keep practicing — related questions