Abstract
The distribution of solar radiation on the Earth's surface produces regular climatic zones, including essential ice covers in the polar regions. Thus it is unjustified to speak of glacial and interglacial periods in a global sense. Climatic zones and polar ice caps have been displaced from time to time by polar wandering both on smaller circular paths during one great epoch of Earth history as well as on long straight courses at the limits of these epochs. Polar wanderings are linked among others with expansion processes of the Earth. Alterations in intensity of solar radiation and in atmospheric processes have influenced the transitional climatic zones and caused an alternation of perlglacial and interperiglacial periods in the belts around the ice caps.
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