Permafrost

noun (uncountable)

/ˈpɜːməfrɒst/

Permanently frozen ground, soil, sediment, or rock, in which temperatures have remained at or below 0°C continuously for two or more years. The active layer above permafrost thaws seasonally; as permafrost degrades under climate warming, it releases stored carbon as CO₂ and methane, creating a critical positive feedback loop in climate models. In India, permafrost exists in Ladakh and the high Himalayas, and thawing is linked to glacial lake outburst flood (GLOF) risks monitored by the National Disaster Management Authority.

✍️ Usage in a UPSC answer

Permafrost degradation in high mountain regions such as Ladakh threatens water sources relied upon by high-altitude communities.

Synonyms

permanently frozen groundpergelisol (technical synonym)cryotic groundfrozen subsoil

Antonyms

active layerseasonally frozen groundtemperate soiltropical soil

🌱 Word Family

permafrost (noun), permafrosted (adjective, rare), active layer (related compound noun), thermokarst (related noun, permafrost degradation landform)

🔡 Root

Permanent + frost; English compound; permanent from Latin permanere = to remain throughout

📜 Etymology

The English compound 'permafrost' is credited to the American geologist Siemon W. Muller (1943), contracting 'permanently frozen ground'. The Russian term is vechnaya merzlota (eternal frost).

🧠 Memory Hook

PERMA-FROST = PERMANENT FROST. The ground never truly thaws; it's frozen 'permanently'. Think of it as the Earth's deep-freeze: a natural refrigerator where ancient organic matter has been stored for thousands of years.

🌍 Geography 📖 Seen in: Plate Tectonics and Volcanism…

Relevant across:GS1 · History, Geography & Society

Same term, other paper:Permafrost (Environment)

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