Glacier ice absorbs red wavelengths more efficiently than blue. The denser and more bubble-free the ice, the more pronounced the effect. This is centuries of compression visible as color. Interior of a glacier cave in the terminal moraine of the Canwell Glacier, Alaska Range.

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Inside a melting glacier cave at the edge of the Canwell Glacier in the Eastern Alaska Range. Water that’s been locked in ice for centuries now falls in a steady rhythm, joining the roar of subglacial streams. Even in power, there’s fragility.

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