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permafrost |
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Soil, silt and rock located in perpetually cold areas which remains frozen year-round. Though a thin layer may thaw during summer months, the majority of the permafrost in a given location will remain frozen until the local climate dramatically changes, as from continental drift toward the equator or global warming. [Geological Society of America Bulletin; v.100; p.948; 1988.] [Science; v.234; p.689; 1986.] Source: Atmospheric Chemistry Glossary
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