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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

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FIGURE 16.26 Glacial ice coverage in the Northern Hemisphere was extensive during the Pleistocene. Glaciers up to several thousand meters thick covered much of North America and Eurasia.

What might be a reason for some areas that were very cold during this time, such as portions of interior Alaska and Siberia, being ice free?

To determine

The reason for some areas being very cold during Pleistocene time, such as the portions of interior Alaska and Siberia being ice free.

Explanation

Permafrost regions are permanently frozen ground that receives year-round ice or snow cover. However, some cold regions do not receive sufficient precipitation, which leads to thick masses of permanent ice accumulations. In much of interior Alaska and Siberia, the regions were too cold and dry during the Pleistocene to produce huge accumulations of snow and ice that occurred elsewhere in the northwestern Europe and North America. Hence, these regions contain periglacial environment...

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