Difference between revisions of "13. Glacial periods"

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Return to [[History 8 Human Origins Concepts]]
 
Return to [[History 8 Human Origins Concepts]]
  
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'''Glacial Periods'''
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Glacial periods are periods in the Earth's history where the climate became ''cooler''. Interglacial periods are periods in Earths history where the climate became ''warmer''. The earth alternates between the two periods every 100,000 years. An example of a glacial period would be the last Ice Age. The last Ice age peaked around 16,000 BCE, and lowered temperatures around 65 degrees fahrenheit. Glacial and Interglacial periods change the organisms and ecosystems around them. For example, many large animals in North America became extinct due to the period changing to an interglacial period.
  
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Glacial periods are an interval of time within an ice age that are marked by colder temperatures and colder advances. Ice ages that have been known to have occurred are the Huronian, Kaegas, Sturtian, Marinoan, Andrean-Saharan, and the most recent one occurring at the near end of the Pleistocene Age which goes by the name of The Ice Age.
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http://geology.utah.gov/wp-content/uploads/ice_ages2.gif
  
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          -Will Leger
  
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'''The Last Glacial Period'''
 
  
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The last glacial period to this day ended at around 16,000 B.C.E. which is also known as the ice age''(Younger Dryas RB)''.  Sea levels dropped by 410 feet exposing vast areas that had once been seabed.  Due to decreasing sea levels, two huge landmasses appeared, one being the sunda, which linked the islands of Indonesia in one large landmass.  The Beringia is know known as the land bridge that connected northeast Asia to the tips of Alaska.  The Beringia was vital in order for the primitive men to cross into north america and begin new adaptions.  Rain fall also decreased for the average rainfall in Britain was the same as that of present day morocco.  Loess, or rock debris and vegetation got blown away from the increasing winds.  Water bodies such as the English Channel and the Persian Gulf dissipated.  Due to the ice age, Homo Ergaster adapted like never before mastering twig huts, improving stone tools and weapons, and adapted immensely in order to hunt the newly evolving prey and predators.  The biggest secret surviving tool who only men could use, was fire.
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''Manual'' page 31
  
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'''Sources'''
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[http://arstechnica.com/science/2008/04/post-glacial-extinction/]
  
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Image
 
  
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http://humanities7.files.wordpress.com/2011/09/earth-last-ice-age.jpg
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'''Pictures'''
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[http://geology.utah.gov/wp-content/uploads/ice_ages2.gif]
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Sources:
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Pages 25-26 in History Manual
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http://library.thinkquest.org/3876/iceage.html
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Latest revision as of 12:01, 17 October 2015

Return to History 8 Human Origins Concepts

Glacial periods are periods in the Earth's history where the climate became cooler. Interglacial periods are periods in Earths history where the climate became warmer. The earth alternates between the two periods every 100,000 years. An example of a glacial period would be the last Ice Age. The last Ice age peaked around 16,000 BCE, and lowered temperatures around 65 degrees fahrenheit. Glacial and Interglacial periods change the organisms and ecosystems around them. For example, many large animals in North America became extinct due to the period changing to an interglacial period.

ice_ages2.gif 

         -Will Leger


Manual page 31

Sources [1]


Pictures [2]

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