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active thermokarst

the process by which characteristic landforms are currently developing as a result of thawing of ice-rich permafrost or melting of massive ice.

thermokarst

the process by which characteristic landforms result from the thawing of ice-rich permafrost or the melting of massive ice.

thermokarst lake

a lake occupying a closed depression formed by settlement of the ground following thawing of ice-rich permafrost or the melting of massive ice.
Increased thawing of frozen ground could create more thermokarst features, like this lake. —Credit: Andrew Slater

thermokarst mound

a hummock remaining after melting of the ice wedges surrounding an ice-wedge polygon.

thermokarst terrain

the often irregular topography resulting from the melting of excess ground ice and subsequent thaw settlement.