7 Geological Phenomena So Crazy, You'll Think They're Photoshopped!

Blue Oceans

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Found all throughout the world, blue holes are underwater sinkholes most known in the Caribbean Sea. Dark blue in hue and apparently limitless depths define these deep, round sinkholes. Blue Holes' unusual blue hue results from the depth of the sinkhole, which absorbs light at various levels to produce a deep blue tint. Several Blue Holes are among the deepest underwater cavernues in the world, several hundred feet deep. Sharks, turtles, and fish among other aquatic life call blue holes home. Because of their unusual beauty and the sense of excitement that accompanies diving and snorkelling an underwater cave, they are also popular sites for these sportsmen. Geologically speaking, some Blue Holes are especially important since they provide researchers with a window into the past of the Earth's sea levels and temperature. Examining silt and fossils discovered in Blue Holes helps scientists to better grasp the future of our earth by learning about historical climate patterns and sea level variations.