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A mound or ridge, largely made from peat, that contains a perennial ice lens and is found in the damper sites of mires in periglacial areas. Widths are in the range 10–30 m, lengths 15–150 m, and heights 1–7 m. Probably palsas are a result of heaving associated with the growth of segregated ice.

Subjects: Plant Sciences and Forestry — Ecology and Conservation.

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