The ice content of permafrost is probably the most important feature of permafrost affecting human life in the north. Ice in the perennially frozen ground exists in various sizes and shapes and has definite distribution characteristics. The forms of ground ice can be grouped into five main types: (1) pore ice, (2) segregated, or Taber, ice, (3) foliated, or wedge, ice, (4) pingo ice,
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