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冻土

冻土指温度在0℃或0℃以下并含有冰的土体或岩体。冻结持续多年，甚至长达数万年以上的冻土，称多年冻土；冬季冻结，夏季全部融化的冻土，称季节冻土。多年冻土中，随季节或昼夜而有冻融变化的上层，称活动层；下部多年不化的土层，称多年冻结层。多年冻土主要分布在气候寒冷和降水量较小的高纬或高山、高原地区。大面积连续分布的冻土，称连续冻土；在连续冻土的外围逐渐过渡为不连续冻土及岛状冻土。

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