In periglacial landscapes, what is the active layer?
1 )
Alternating bands of light coloured sand and darker silt deposited in proglacial lake beds.
2 )
An elongated narrow sinuous ridge composed of stratified sediment.
3 )
Ground that remains permanently below 0°C for at least two consecutive years.
Soil lying above the permafrost that thaws and freezes seasonally.
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