The phenomenon of the collection of the snow layers and the occurrence of avalanches in the United States.
United States USA Date:1943 Duration:2 min 22 sec Sound:Yes
A film depicts the causes of avalanches. Mountainous region in the United States. Snow covered mountains. Men standing and working in the area. Every new snowfall adds a new layer of snow on the crust. The phenomenon is explained. The collection of the layers of snow and the occurrence of avalanches is explained. A diagram shows the phenomenon. Men trudging through the snow. Animated diagram shows the occurrence of avalanches.
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