frozen ground or permafrost

frozen fringe

the zone in a freezing, frost-susceptible soil between the warmest isotherm at which ice exists in pores and the isotherm at which the warmest ice lens is growing.

frost-susceptible soil

soil in which segregated ice will form (causing frost heave) under the required conditions of moisture supply and temperature.

frost-susceptible ground

ground (soil or rock) in which segregated ice will form (causing frost heave) under the required conditions of moisture supply and temperature.

frost

the condition which exists when the temperature near the earth's surface and earth-bound objects falls below freezing (0 degrees Celsius or 32 degrees Fahrenheit).

frost-stable soil

soil in which little or no segregated ice forms during seasonal freezing.

frost-stable ground

ground (soil or rock) in which little or no segregated ice forms during seasonal freezing.

frost wedging

the mechanical disintegration, splitting or break-up of rock by the pressure of water freezing in cracks, crevices, pores, joints or bedding planes.

frost weathering

the disintegration and break-up of soil or rock by the combined action of frost shattering, frost wedging and hydration shattering.

frost sorting

the differential movement of soil particles of different sizes as a result of frost action.

frost shattering

the mechanical disintegration of rock by the pressure of water freezing in pores and along grain boundaries.

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