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b_b · 3782 days ago · link · · parent · post: One of Several Giant Sinkholes which appeared in Siberia recently
Not sure on how quickly they form, but there was a post a while back about how methane released from the permafrost might be destabilizing the soil, if I remember right.
organicAnt · 3782 days ago · link ·
The edge is raised and there's debris around it suggesting that pressure was applied from the underground up. But did you notice how smooth the wall of the hole is? I haven't seen this in other sink holes!
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