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Photographer's Note

One more spectacular iceberg we seen on our cruise on Jökulsárlón glacier lake. By the way, you know icebergs are made of snow or ice, snow is white, ice is transparent, so why do some icebergs look blue ? Actually the ice in the glaciers, which icebergs are made of, is submitted to high pressures for countless years. This pressure remove the air and the reflecting parts of the ice. When the white daylight meets the iceberges, it is not reflected but absorbed. Yellow and red are first absorbed, and when you remove these colours from the light the main remaining colour is blue. This is the reason why some icebergs, the ones made with the oldest ice, look blue !

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Additional Photos by Olivier THIERRY (chawax) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 1335 W: 28 N: 3021] (19078)
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