Answer
Permafrost refers to permanently frozen ground, typically found in Arctic and high-altitude regions. Disturbing permafrost can lead to unstable ground that may slide, flow, or subside due to several reasons. When permafrost is disturbed by excavation or construction activities, the ice within the frozen ground melts, causing the ground to lose its stability. The melting of ice can weaken the soil and lead to landslides or soil flows. Additionally, permafrost acts as a support for the overlying ground, and when it thaws, the ground can subside or sink, leading to the development of sinkholes or depressions in the landscape. The loss of stability in permafrost regions poses significant challenges for infrastructure development and human activities in these regions.
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