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Which one among the following is not a coral reef island?
1. Great Barrier Reef, Australia
2. Rainbow Reef, Fiji
3. Swaraj Island, India
4. Kyushu Island, Japan

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Correct Answer - Option 4 : Kyushu Island, Japan

The correct answer is Kyushu Island, Japan.

  • Kyushu Island (Japan) is not a Coral Reef Island.
  • A coral island is a type of island formed from coral detritus and associated organic material. It occurs in tropical and sub-tropical areas, typically as part of coral reefs which have grown to cover a far larger area under the sea.
  • The Great Barrier Reef is the world's largest Coral Reef System composed of over 2900 individual reefs and 900 islands stretching for over 2,300 km over an area of approximately 344,400 km².
    • The reef is located in the Coral Sea, off the coast of Queensland, Australia. 
  • The Rainbow Reef is a reef in the Somosomo Strait between the Fijian islands of Taveuni and Vanua Levu. 
    • It is one of the most famous dive sites in the South Pacific. 
  • Swaraj Island is part of Ritchie's Archipelago, in India's the Andaman Islands.
    • It's known for its dive sites and beaches, like Elephant Beach, with its coral reefs.

  • Coral reefs are one of the most biologically diverse marine ecosystems on Earth.
  • Corals grow over geological time scales and have been in existence for about 200 million years.
  • Coral reefs play an important role in the marine ecosystem and support the habitats of flora and fauna in the sea.
  • Australian Great Barrier Reef, Belize Barrier Reef, and the New Caledonian Barrier Reef, The Mesoamerican Barrier Reef System, The Florida Reef Tract, and Rainbow Reef are some examples of coral reef.
  • In India, Coral reefs are present in the areas of Gulf of Kutch, Gulf of Mannar, Andaman & Nicobar, Lakshadweep Islands, and Malvan. 

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