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Low centered polygons are ice-wedge polygons in which thawing of ice-rich permafrost has left the central area in a reletively depressed position. (photo: IPA website)
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Permafrost in the Swiss Alps. (photo: IPA website) Superficial drainage amplifies thawing of the ice-wedges under the polygon walls, creating these spectacular chains of lakes. (photo: IPA website) Aerial view of the old runway now used for housing. (photo: Lawrence Hislop - Grida.no) Aerial view of Shishmaref in N. Alaska (photo: Lawrence Hislop - Grida.no) Sinking seawall in Shishmaref in N. Alaska (photo: Lawrence Hislop - Grida.no) Wet Tundra at Northern Yamal, Russian Arctic (photo: Lawrence Hislop - Grida.no) Polygon Tundra, Lena Delta (photo: Peter Prokosch - Grida.no) Permafrost soil stone formations, Kongsfjord (photo: Peter Prokosch - Grida.no) Arctic tundra, Taimyrski Zapovednik (nature reserve), central Taimyr, Russia (photo: Peter Prokosch - Grida.no) A rock glacier is a mass of rock fragments and finer material, on a slope, that contains either interstitial ice or an ice core and shows evidence of past or present movement. (photo: IPA website) A pingo is perennial frost mound consisting of a core of massive ice and covered with soil and vegetation. (photo: IPA website) Low centered polygons are ice-wedge polygons in which thawing of ice-rich permafrost has left the central area in a reletively depressed position. (photo: IPA website) Polygons typically form networks extending upon large areas, here in Spitzbergen in Svalbard. (photo: IPA website) Polygon result from thermal contraction cracking of ground and form random or oriented polygon patterns. These polygons are in Siberia. (photo: IPA website) A flooded arm of the Mackenzie Delta, Canada, showing degraded ice-wedge polygons. (photo: IPA website) A thermokarst lake occupies a closed depression formed in the settlement of the ground following thawing of ice-rich permafrost. These lakes are in Mackenzie Delta, Canada. (photo: IPA website)

Low centered polygons are ice-wedge polygons in which thawing of ice-rich permafrost has left the central area in a reletively depressed position. (photo: IPA website)

 
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