What is coral island?

What is coral island? Correct Answer Terrestrial Sea

Coral islands are formed by the growing corals in shallow sea water with gentle temperatures. These are mostly found in tropical and sub-tropical zones. New corals develop on pre-existing corals which leads to formation of islands. Corals are living beings and are rich in calcium. Coral island, tropical island built of organic material derived from skeletons of corals and numerous other animals and plants associated with corals.

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বাংলাদেশের কোন দ্বীপ প্রবাল দ্বীপ নামে পরিচিত? (Which island of Bangladesh is known as Coral Island?)
Which of the following has released the report titled "Status of Coral Reefs of the World: 2020" that tells about a 14 percent reduction in the world's coral reefs from 2009 to 2018?