What is the geological term for partially compacted snow that has survived a summer season without melting?
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Firn is snow that has persisted for more than a year and has been compacted into a dense state, serving as the crucial transition stage before it becomes solid glacier ice. Sastrugi, on the other hand, are sharp ridges formed on a snow surface by wind. Photo: Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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