An ice age is a period of long-term downturn in the temperature of Earth's climate, resulting in an expansion of the continental ice sheets, polar ice sheets and mountain glaciers ("glaciation"). Glaciologically, ice age is often used to mean a period of ice sheets in the northern and southern hemispheres; by this definition we are still in an ice age (because the Greenland and Antarctic ice sheets still exist). More colloquially, when speaking of the last few million years, ice age is used to refer to colder periods with extensive ice sheets over the North American and Eurasian continents: in this sense, the last ice age ended about 10,000 years ago. This article will use the term ice age in the former, glaciological, sense; and use the term glacial periods for colder periods during ice ages and interglacial for the warmer periods.

Many glacial periods have occurred during the last few million years, initially at 40,000-year frequency but more recently at 100,000-year frequencies. These are the best studied. There have been four major ice ages in the further past.

Origin of ice age theory

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The idea that, in the past, glaciers had been far more extensive was folk knowledge in some alpine regions of Europe (Imbrie and Imbrie, p25, quote a woodcutter telling Jean de Charpentier of the former extent of the Swiss Grimsel glacier). No single person invented the idea ^*. Between 1825 and 1833, Charpentier assembled evidence in support of the concept. In 1836 Charpentier convinced Louis Agassiz of the theory, and Agassiz published it in his book Étude sur les glaciers (Study of Glaciers) of 1840.

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irelands turned to ice age, scotland and uk are covered in snow, minus 15 degrees meanin global warming is havin a cold effect :(
p1nkt1gger (Marguerita/Aoífe ) Sun, 03 Jan 2010 15:00:35 -0000
irelands turned to ice age, scotland and uk are covered in snow, minus 15 degrees meanin global warming is havin a cold effect :(
MENGULANG kembali donlot ice age 3..huff...
ranggapapz (rangga renaldi m) Sun, 03 Jan 2010 15:00:14 -0000
MENGULANG kembali donlot ice age 3..huff...
Ice Age 3: Die Dinosaurier sind los gibts als Blu ray oder DVD plus Digital Copy)! Top Film für Liebhaber ! http://bit.ly/78oN9E
BauenWohnenNow (Bauen & Wohnen) Sun, 03 Jan 2010 14:55:16 -0000
Ice Age 3: Die Dinosaurier sind los gibts als Blu ray oder DVD plus Digital Copy)! Top Film für Liebhaber ! http://bit.ly/78oN9E
this weather sucks;; its like the next ice age.
karlalalalala (Karla ) Sun, 03 Jan 2010 14:51:53 -0000
this weather sucks;; its like the next ice age.
Min #FilmI2010 liste indtil nu: Whatever Works (aka Mig & Melody), Die Hard 4, Star Trek: Generations, Ice Age 2 og Fong Juk (aka Exiled)
jaluth (Jan Lund Thomsen) Sun, 03 Jan 2010 14:51:13 -0000
Min #FilmI2010 liste indtil nu: Whatever Works (aka Mig & Melody), Die Hard 4, Star Trek: Generations, Ice Age 2 og Fong Juk (aka Exiled)
mayday...mayday...I'm done!!! (buck..ICE AGE 3)
de_anan (Husnan Karim) Sun, 03 Jan 2010 14:50:11 -0000
mayday...mayday...I'm done!!! (buck..ICE AGE 3)

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