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Frozen Ground Word Definitions
- active layer
- the soil above permafrost, that melts each year in the summer sun. The active layer is
where plant roots and burrowing insects are found.
- ice wedge
- a buildup of ice in frozen soil, that is wedge-shaped in cross-section.
- permafrost
- permanently frozen ground.
- pingo
- a hill created when water pools and freezes under the root mat. When the water freezes, it
expands, pushing up the soil.
- polygon
- a pattern on the surface of frozen ground formed above ice wedges. Polygons can have
low or high centers. Low-center polygons are shown and described in this web site.
- thermokarst lake
- an arctic lake formed when water holds heat that thaws the permafrost below.
