frozen ground or permafrost

polygon trough

the narrow depression surrounding a high-centre polygon.


literally means many angled; polygons are closed, multi-sided, roughly equidimensional shapes, bounded by more or less straight sides; some of the sides may be irregular; in cryospheric science, it refers to patterned ground formations.


an Inuvialuktun term for a perennial frost mound consisting of a core of massive ice with soil and vegetation cover; the size can range from a few meters to tens of meters, in both diameter and height; can be found in continuous and discontinuous permafrost zones.


layer of soil or rock, at some depth beneath the surface, in which the temperature has been continuously below 0°C for at least several years; it exists where summer heating fails to reach the base of the layer of frozen ground.

Poisson's ratio

the absolute value of the ratio between linear strain changes, perpendicular to and in the direction of a given uniaxial stress change.


part of the geologic timescale, corresponding to the time period from 1.81 million to 11,550 years before the present.

plastic frozen ground

fine-grained soil in which only a portion of the pore water has turned into ice.

planetary permafrost

permafrost occurring on other planetary bodies (planets, moons, asteroids).

pingo scar

a pingo remnant in a contemporary non-permafrost environment.

pingo remnant

a collapsed pingo.


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