Timeline of glaciation

Timeline Of Glaciation

Timeline of glaciation

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There have been five known ice ages in the Earth's history, with the Earth experiencing the Quaternary Ice Age during the present time. Within ice ages, there exist periods of more severe glacial conditions and more temperate referred to as glacial periods and interglacial period, respectively. The Earth is currently in an interglacial period of the Quaternary Ice Age, with the last glacial period of the Quaternary having ended approximately 10,000 years ago with the start of the holocene.

Known ice ages


The second ice age, and possibly most severe, is estimated to have occurred from 850 to 635 Ma (million years) ago, in the late Proterozoic Age and it has been suggested that it produced a second<ref

name="2nd of two">Miracle Planet: Snowball Earth, (2005) documentary, Canadian Film Board, rebroadcast 25 April 2009 on the Science Channel (HD) "Snowball Earth" in which the earth iced over completely. It has been suggested also that the end of this second cold period<ref

name="2nd of two"/> was responsible for the subsequent Cambrian Explosion, a time of rapid diversification of multicelled life during the Cambrian era. However, this hypothesis is still controversial,van Andel, Tjeerd H. (1994) New Views on an Old Planet: A History of Global Change 2nd ed. Cambridge University Press, Cambridge, UK, ISBN 0521447550 though is growing in popularity among...
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