About 40 percent of interior Alaska is underlain by ice-rich permafrost—permanently frozen grounds made up of soil, gravel and sand—bound together by ice. Certain conditions, such as climate warming, have intensified tundra wildfires which have profound implications for permafrost thaw.
https://www.lifetechnology.com/blogs/life-technology-science-news/new-technique-maps-large-scale-impacts-of-fire-induced-permafrost-thaw-in-alaska
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