Why is glacier ice blue?

Glacier ice is 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.

Learn more: USGS Water Science School - Glaciers: Things to Know 

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Image: Ice Cave

Ice Cave

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

Attribution: Land Resources
Image: Ice Queen

Ice Queen

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

Attribution: Land Resources
Image: Matanuska Glacier

Matanuska Glacier

Matanuska Glacier, Alaska

Attribution: Land Resources