__________ is a group of islands found in the tropical oceans consisting of coral reefs and a central depression.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Atoll.
- An Atoll is a ring-shaped coral reef, island or chain of islands around a body of water called a lagoon.
- The process of atoll formation may take as long as 30,000,000 years to occur.
- Atolls are more or less annular reef and reef-island systems found mostly in oceanic mid-plate settings, where they rest on the peaks of submarine volcanic edifices.