. The polar and tropical worlds [microform] : a description of man and nature in the polar and equatorial regions of the globe : two volumes in one : embracing also an account of the expeditions of all the Arctic explorers from the discovery of Iceland, over one thousand years ago, to Hall's last expedition in the northern world, together with the wonderful discoveries and adventures of Agassiz, Livingstone, Wallace, and other distinguished travelers in the tropical countries. Arctic races; Tropics; Natural history; Races arctiques; Régions tropicales; Sciences naturelles; genealogy. THE ARCTI
. The polar and tropical worlds [microform] : a description of man and nature in the polar and equatorial regions of the globe : two volumes in one : embracing also an account of the expeditions of all the Arctic explorers from the discovery of Iceland, over one thousand years ago, to Hall's last expedition in the northern world, together with the wonderful discoveries and adventures of Agassiz, Livingstone, Wallace, and other distinguished travelers in the tropical countries. Arctic races; Tropics; Natural history; Races arctiques; Régions tropicales; Sciences naturelles; genealogy. THE ARCTIC SEAS. 8T ul»U'1)r<'a(ltli, would bo iiisiifliciont to prvvciit its total omiy other i»liysical causes. A inaiiiiilicfiil nvsIi'iu of currt'iits in coiilimially tlis|ilai-iiiLj tin- waters of llio oci-aii, .ami foiriiiL? ihu Hoods of tlu; troiiit'al iVLiioiis to 'i- to the pok-, whilci tho cold slri'ums of tho fritcid zone .arc as coiislantly iiii,L,'rutiiiwin;4 throUi^h the broad fj^ateway east of Spit/.ber^eii, and forcintf out a return eurreiil of cold water to the west uf Si»it/bergen, aiul through Davis's Strait. Tlie eotniiariUivi'ly floods which, in i:oiisequence of this <i;re,it law of circiiiatioii, c(une ftourini,' into the Arctic sead, naturally require some tiiuo liifore tlu'y are sufliciently chilled to be converted into ice; and as sea-water has its niaxiniuni of density, or, in other words, is heaviest a few decrees above the freezing-point of water, and then necessarily sinks, tho whole depth of tho. fd by loirj; I consider- sea must of course bo cooled down to that temperature before freezing can take place. Ice being a bad conductor of heat, likewise limits the process ot congelation ; for after attaining a thickness of ten or fifteen feet, its growth is very slow, and probably even ceases altogether; for when floating fields, or tloes, are found of a greater thickness, this increase is duo to tho snow that falls upon their surfac
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Keywords: ., bookcentury1800, bookdecade1870, books, booksubjectnaturalhistory
