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        6-12

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        Part of NOVA
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        How Do Avalanches Form?

        There are two basic elements to an avalanche: a steep, snow-covered slope and a trigger that causes a weak layer within the snow pack to collapse. This video segment adapted from NOVA reveals that the shape of the ice crystals of snowflakes within a snow pack is also a critical factor. How well the crystals bond together determines how strong a snow layer is and therefore how stable the snow pack is.

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