Most are located below the water surface, about 1, 200-1600 meters, found in the central Pacific. In the ocean in the tropical area, such as in the equator with surface water temperature not lower than the 20 degrees Celsius. Volcano island this area is formed by the coral around.Or sinking or the water level rises. The coral will grow with higher water level, while the vertical island. The next phase, when the island was sinking into the inside. Coral reefs surrounding a lake called (similar Lagoon).Called Atoll.
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