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  • Permafrost in Canada

    by Roger J.E. Brown

    Permafrost is the thermal condition of the earth's crust when its temperature has been below 32°F continuously for a number of years. Half of Canada's land surface lies in the permafrost region--either in the continuous zone where the ground is frozen to a depth of hundreds of feet, or in the ... अधिक

    Language: ENG
    कॉपीराइट: 1970
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