![IMG_20170423_112421.jpg](https://steemitimages.com/DQmT6978kW6dLpMZsvCb9n1WfP3xVsABoE5YkWy2T9mKaLx/IMG_20170423_112421.jpg)
You must have seen, a large coral arising in the middle of the sea. I still do not understand why this can happen, can anyone explain the phenomenon of the occurrence of a large rock in the middle of the sea, or is there a so-called small island above the sea?
@zafran
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