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date: 29 May 2020

firn 

Source:
A Dictionary of Geography
Author(s):

Susan Mayhew

Ice formed when falls of snow fail to melt from one season to another. As further snow accumulates, its weight presses on earlier snow, compacting and melting it to a mass of globular particles of ice with interconnecting air spaces. Where temperatures are around 0 °C, snow can turn to firn within five years, but the process takes much longer in very cold conditions. See ... ...

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