How is blue ice formed?

the ice is always colorless
in the upper atmosphere
in the depths of the glacier
from salt sea water
Blue ice occurs under the surface of a glacier as a result of repeated, slow thawing and freezing of water. This process speeds up when snow falls on the top of a glacier, the ice compresses, air bubbles are squeezed out and ice crystals enlarge, making the ice appear blue. In the Greenland environment this process takes from 100 up to 150 years.
Michał
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Very interesting!
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Answers by country

the ice is always colorless
in the upper atmosphere
in the depths of the glacier
from salt sea water
answers
flagGermany
20%
10%
70%
0%
10
flagthe United Kingdom
6%
6%
68%
18%
16
flagthe United States
20%
10%
60%
10%
10
flagPoland
24%
12%
39%
22%
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