| Summary: | Progress since 1928 is reviewed in the study of permafrost and related phenomena, geothermal investigations, sedimentary geology and oil exploration, metalliferous lodes, radioactive minerals and volcano research. Problems for future research are indicated: the distribution, physical properties, and origin of permafrost; its relation to climate, vegetation, and animal life; its effect on human activity; and the development of equipment for use in low temperatures. Need is stated for magnetic and electrical investigations in which the modifying effects of the earth's crustal rocks are taken into account.
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