Which one of the following is not an Atoll?

Question

Accepted Answer

The Great Barrier Reef is not an atoll. Here's why, and why the other options are incorrect:

*   **Option 4: Great Barrier (Correct)** The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometers off the coast of Queensland, Australia. It's formed by coral growth on a continental shelf. It's a complex system of reefs and islands, but it's fundamentally a reef system associated with a continent, not a ring-shaped coral reef surrounding a lagoon formed from a subsiding volcano. Therefore, it is not an atoll.

*   **Option 1: Kwajalein (Incorrect)** Kwajalein is an atoll. It is part of the Marshall Islands and is a ring-shaped coral reef enclosing a lagoon.

*   **Option 2: Funafutti (Incorrect)** Funafuti is an atoll. It is the capital of Tuvalu and is a ring-shaped coral reef enclosing a lagoon.

*   **Option 3: Bikini (Incorrect)** Bikini Atoll is an atoll. It is part of the Marshall Islands and is famous for the nuclear weapons testing that occurred there. It is a ring-shaped coral reef enclosing a lagoon.