Water coming from glaciers often appears to be a deeper color blue than water found in other places. When light reflects off of a glacier, the long wavelengths of light (red color) is absorbed by the ice and the blue and green hues of light are scattered among the surface of the glacier. This gives them the appearance of being a blueish green. The ice is essentially acting as a filter and the thicker the ice is, the more blue it will appear. The water around it is still clear, but the ice reflects on to it and makes it seem as though it is much darker than it really is.
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