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Pressure compacts glacial ice and makes it dense and appear blue-colored. As glaciers move, their ice also picks up rocks and soil.
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General : Blue glacial ice.
An ice cave, formed underneath the Vatnajokull glacier (one of the
Jökulsárlón Glacier Lagoon Blue Ice and Black Sand in Iceland
Why is glacier ice blue? - Woods Hole Oceanographic Institution
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Why is Glacier Ice Blue Matanuska Ice Climbing Adventures
Why is glacier ice blue?, BLOG
Why is glacier ice blue?
Science of Glaciers National Snow and Ice Data Center