Fig. 2

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Examples of planetary depressions in different contexts. (a) Okmok caldera (Alaska). (b) Martian impact crater in Lunae planum (Colour and Stereo Surface Imaging System, CaSSIS). (c) Landslide in Quebec. (d) Kettle holes in Wrangell-Saint-Élie national parc (Alaska). (e) Sinkhole in Russia. (f) Thermokarst lake in the Siberian permafrost. (g) Collapsed pingo (Canada). (h) Retrogressive thaw slump in the Siberian permafrost.
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