The permafrost has the ability to keep thickening season after season in high-latitude areas. Which factor limits this thickening process?

Name: The permafrost has the ability to keep thickening season after season in high-latitude areas. Which factor limits this thickening process?
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Question

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Earth's interior heat limits the thickening of permafrost by providing a heat source from below, which counteracts the cooling and freezing from the surface, thus preventing permafrost from thickening indefinitely.

The Permafrost Has the Ability to Keep Thickening Season After