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永久凍土

出自維基百科,自由嘅百科全書
永久凍土

永久凍土英文permafrost)係指溫度低過 0 °C 至少兩年嘅岩土層,覆蓋成個地球約莫11%,主要集中喺北半球阿拉斯加格陵蘭加拿大西伯利亞

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