Why is glacier ice blue?

Because the red (long wavelengths) part of white light is absorbed by ice and the blue (short wavelengths) light is transmitted and scattered. The longer the path light travels in ice, the more blue it appears.

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Ice Cave

Block of Ice on Vitus Lake, from Bering Glacier, Alaska

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Block of Ice on Vitus Lake, from Bering Glacier, Alaska

Image: Matanuska Glacier

Matanuska Glacier

Matanuska Glacier, Alaska