Formation of glaciacion?

Answer 1

Glacier Formation
http://users.aber.ac.uk/slh3/formation.htm

Glaciation
http://www.ncdc.noaa.gov/paleo/glaciation.html

Answer 2

A glacier is a large, long-lasting river of ice that is formed on land and moves in response to gravity. Glaciers are more or less permanent bodies of ice and compacted snow that have become deep enough and heavy enough to flow under their own weight.
There are two main types of glaciers: alpine glaciers, which are found in mountain terrains, and continental glaciers, which cover large areas of continents.
The largest glaciers are continental ice sheets, enormous masses of ice that are not affected by the landscape and extend over the entire surface, except on the margins, where they are thinnest. Antarctica and Greenland are the only places where continental ice sheets currently exist.
The snow which forms temperate glaciers is subject to repeated freezing and thawing... Under the pressure of the layers of ice and snow above it, this granular ice fuses into denser firn. Over a period of years, layers of firn undergo further compaction and become glacial ice.

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