Nature trail Surses
Exploratour 07: Dichtung aus Eis
Normally, water quickly seeps into the calcareous subsoil. How did the lake on this limestone plain come about? One possible explanation is that the subsoil here is constantly frozen and the water accumulates.
Permanently frozen soil or permafrost is common in the Alps above 2500 m. In summer, only the top layer thaws temporarily.
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