DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Ice cave in Breidamerkurjokull, an outlet glacier of the Vatnajokull icecap in southeastern Iceland. Such ice caves or ice caverns are formed by subglacial meltwater streams but may be accessible during the cold season when little any water flows through them. The water visible here is a stagnant pond. Glacier ice typically looks blue when seen from underneath.
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