Active layer

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  1. The surficial deposit that undergoes seasonal changes of volume, swelling when frozen or wet, and shrinking when thawing and drying. AGI
  2. A surface layer of ground, above the permafrost, that is frozen in the winter and thawed in the summer. Its thickness ranges from several centimeters to a few meters. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms


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