DARK BLUE BOTTOM OF AN ICEBERG
In this photograph by Aoraki Mount Cook Alpine Village, we see the dark blue bottom of an iceberg in the terminal lake of New Zealand’s largest glacier, the Tasman Glacier.
According to dr_glaciology, the ice is so blue because it was near the bed of the glacier and thus under a lot of pressure from the overlying ice. The pressure means the ice lacks pockets of air, giving it the dark blue hue.
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