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]] | ||
| − | During interglacials, the Earth has normal climates-warm at the equator, cold at the poles. Interglacial periods gradually grow colder, and the ice spreads south towards the Equator, covering large parts of Europe and North America. Asia becomes bitterly cold | + | |
| + | == Glacial Periods == | ||
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| + | During interglacials, the Earth has normal climates-warm at the equator, cold at the poles. Interglacial periods gradually grow colder, and the ice spreads south towards the Equator, covering large parts of Europe and North America. Asia becomes bitterly cold but in some cases will not freeze if there is not a sufficient amount of rain. This weather and climate is part of a glacial period. After a certain number of years, it reverses back to an interglacial period and the cycle happens again. This cycle is caused by variations in the Earth's orbit through time that change the amounts of solar radiation that hits the Earth in each season. | ||
http://www.ncdc.noaa.gov/paleo/abrupt/images/data2-hemisphere.gif | http://www.ncdc.noaa.gov/paleo/abrupt/images/data2-hemisphere.gif | ||
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| + | == Sources == | ||
National Oceanic and Atmospheric Administration, "Glacial-Interglacial Periods" http://www.ncdc.noaa.gov/paleo/abrupt/data2.html | National Oceanic and Atmospheric Administration, "Glacial-Interglacial Periods" http://www.ncdc.noaa.gov/paleo/abrupt/data2.html | ||
Manual Chapter 3, page 23 | Manual Chapter 3, page 23 | ||
Revision as of 19:02, 7 October 2014
Return to History 8 Human Origins Concepts
Glacial Periods
During interglacials, the Earth has normal climates-warm at the equator, cold at the poles. Interglacial periods gradually grow colder, and the ice spreads south towards the Equator, covering large parts of Europe and North America. Asia becomes bitterly cold but in some cases will not freeze if there is not a sufficient amount of rain. This weather and climate is part of a glacial period. After a certain number of years, it reverses back to an interglacial period and the cycle happens again. This cycle is caused by variations in the Earth's orbit through time that change the amounts of solar radiation that hits the Earth in each season.
Sources
National Oceanic and Atmospheric Administration, "Glacial-Interglacial Periods" http://www.ncdc.noaa.gov/paleo/abrupt/data2.html
Manual Chapter 3, page 23
