Deutsch: Kollabierter “closed-system Pingo” im Mackenziedelta (Hubschrauber als Maßstab). Die Umrisse des entleerten Sees (Ursache für den Pingo) sind noch gut zu erkennen. Aufnahme: Lorenz King, 8. August 1987
English: Collapsed pingo in the Mackenzie Delta, helicopter for scale. The thick peat cover protects the massive ground-ice below. The formerly drained lake can be outlined. Photo: Lorenz King, August 8,1987
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