Oddi wrth Wicipedia, y gwyddoniadur rhydd.
Gall y ffeil hon gael ei defnyddio gan nifer o brosiectau eraill.
| Description |
Northern hemisphere glaciation during the last ice ages. The set up of 3 to 4 km thick ice sheets caused a sea level lowering of about 120 m. Also the Alps and the Himalya were covered by glaciers. The limit of winter sea ice coverage was much more to the south.
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| Source |
own work; redrawn, supplemented and modified from a grafic of the United States Geological Survey
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| Date |
2000-04-07
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| Author |
Hannes Grobe 23:06, 21 July 2006 (UTC), Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
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| Permission |
Own work, share alike, attribution required (Creative Commons CC-BY-SA-2.5)
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| Other versions |
in French : Image:Northern_icesheet-fr.png
http://pubs.usgs.gov/gip/continents/map.jpg |
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I, the author of this work, hereby publish it under the following license:
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