frozen ground or permafrost

ice-cored topography

topography that is due almost solely to differences in the amount of excess ice underlying its surface.

ice-bonded permafrost

ice-bearing permafrost in which the soil particles are cemented together by ice.

ice-bearing permafrost

permafrost that contains ice.

ice wedge

narrow ice mass that is 3 to 4 meters (10 to 13 feet) wide at the ground surface, and extends as much as 10 meters (33 feet) down; a decrease in temperature during the winter leads to ice wedge cracks in the ground around ice wedges; during the summer, these cracks accumulate melt-water and sediment, forming pseudomorphs.

ice vein

an ice-filled crack or fissure in the ground.

ice segregation

the formation of discrete layers or lenses of segregated ice in freezing mineral or organic soils, as a result of the migration (and subsequent freezing) of pore water.

ice lens

a dominantly horizontal, lens-shaped body of ice of any dimension.

ice content

the amount of ice contained in frozen or partially frozen soil or rock.

ice

the solid crystalline form of water.

hydrothermal talik

a layer or body of noncryotic unfrozen ground in a permafrost area, maintained by moving groundwater.

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