An avalanche results from a large mass of snow and ice suddenly slipping from its position and moving rapidly down a slope.
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- NOVA Online: Elements of a Slide Explains why avalanches are difficult to predict, and illustrates the different ways they can form.
- Avalanche Dangers Often are not Apparent to the Novice Questions and answers about what an avalanche is, and the dangers of them.
- Colorado Avalanche Information Center Provides avalanche forecasts and warnings for Colorado. Includes accident reports and educational resources.
- Avalanche Awareness Explains why we need to worry about avalanches, and describes the different types.
- Avalanche Types Illustrated explanations of how they are formed, and why they behave differently.
- Guardian Unlimited: Cold Comfort Article warns of the dangers of avalanches when skiing.
- Snow Avalanches Facts and figures from the National Snow and Ice Data Center. Includes safety advice and an explanation of the danger scale.