Question

_____ are coral islands consisting of reefs surrounding a lagoon.

Answer 1

An atoll. An atoll is a ring shaped reef, island or chain of islands formed by coral.

Answer 2

Coral atoll

Step-by-step explanation:

• A coral island is an island that is formed by organic matter and occurs in tropical and subtropical areas. Coral reefs forms around the volcanic hotspots as the ocean undergoes submergence.

• The atoll is a ring-shaped coral reef that surrounds a lagoon partially or completely. As it forms over the volcanic creator and hence prevents the water from entering the lagoon.