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The top 10 fascinating natural phenomena in the world (4)

People's Daily Online)  15:25, February 21, 2013  

Blue Hole. A Blue Hole is basically a cave or underwater sinkhole. The hole appears in dark blue, because the blue cannot be absorbed by water, like the other colors in the spectrum. (Photo/Global Time)


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(Editor:HuangJin、Zhang Qian)

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