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from Part III - The cryosphere past and future
Published online by Cambridge University Press: 15 April 2022
The Earth has undergone enormous changes in its snow and ice cover and temperature during geological time (Figure 9.1). There have been at least six major Ice Ages when large parts of the Earth’s surface are covered by glaciers and extensive ice sheets, as well as periods when there has probably been no ice, like the Cretaceous; however, there is no strict quantitative definition.
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