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Permafrost
? TBD
Type of soil in frozen state
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Wikipedia

Permafrost (from perma- 'permanent' and frost) is soil or underwater sediment which continuously remains below 0 °C (32 °F) for two years or more; the oldest permafrost has been continuously frozen for around 700,000 years. Whilst the shallowest permafrost has a vertical extent of below a meter (3 ft), the deepest is greater than 1,500 m...

Instance of
Soil type
Subclass of
Soil
Geographical feature
References
Wikidata