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In conductive heat transfer mechanism daily (diurnal) temperature variations almost damp in a layer as deep as 1 m, and annual variation do it as deep as 18-21 m. In case of coincidence of periodic heating with flui d mass transfer (downward percolation of surface water from rivers), thickness of the layer with periodic temperature fluctuations increases significantly. This discovery with author`s priority registered August,19, 1964, was made by N.M. Frolov. We consider the research on temperature waves created in...