Glaciation

n.	1.	Act of freezing.
	2.	That which is formed by freezing; ice.
	3.	The process of glaciating, or the state of being glaciated; the production of glacial phenomena.

Noun	1.	glaciation - the condition of being covered with glaciers or masses of ice; the result of glacial action; "Agassiz recognized marks of glaciation all over northern Europe"
	2.	glaciation - the process of covering the earth with glaciers or masses of ice

environmental condition, glaciate