地理漫步·世界地理英语30篇（5）
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Permafrost Thaws as Temperatures Rise
永久冻土随气温升高而融化
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Permafrost is ground frozen for two or more consecutive years.永久冻土是指连续两年或更长时间保持冻结状态的土壤。
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It covers nearly one-quarter of Earth's northern land area.它覆盖了地球北半球近四分之一的陆地面积。
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Thawing permafrost releases stored carbon dioxide and methane.冻土融化会释放出储存的二氧化碳和甲烷。
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Buildings and roads sink where frozen ground melts unevenly.冻土不均匀融化导致建筑物和道路下沉。
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New lakes form in depressions left by melted ice wedges.冰楔融化后留下的凹陷处会形成新湖泊。
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Plant roots reach deeper into newly thawed soil layers.植物根系可深入新解冻的土壤层。
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Scientists drill cores to measure permafrost depth and temperature.科学家通过钻取岩芯来测量冻土深度和温度。
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Thaw patterns vary by slope, soil type, and vegetation cover.冻土融化模式因坡度、土壤类型和植被覆盖而异。