noun[mass noun] Geology
A form of periglacial topography resembling karst, with hollows produced by the selective melting of permafrost.
- Deep permafrost thawing may result in irregular surface subsidence and thermokarst pits and mounds.
- Warming of permafrost, thawing of ground ice, and development of thermokarst terrain have been documented over the past several decades.
- The forest owes its appearance to an adjacent lake, one of a number of thermokarst lakes in the region.
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