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Comprehensive
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B horizon the subsoil in a geologic soil profile, bearing a concentration of material leached from the topsoil.
hardpan any hard layer beneath the soil, such as hard subsoil or clay. [1/2 definitions]
permafrost the permanently frozen subsoil layer or areas found in arctic and subarctic regions.
tundra the characteristic combination of marshy soil, frozen subsoil, and plant life such as mosses, lichens, and low-growing shrubs, of such an area. [1/2 definitions]