1 द्वारा ईबुक Max I Krugger
Max I Krugger & Harry P. Stern: New Permafrost and Glacier Research
In geology, permafrost or permafrost soil is soil at or below the freezing point of water (0 A(deg)C or 32 A(deg)F) for two or more years. Ice is not always present, as may be in the case of …
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