What can trigger an avalanche?
What is the avalanche "danger zone"?
How are people working to prevent avalanches from harming others?
Why do you think skiing can trigger an avalanche, but a person yelling would not?
- Approximately 90% of avalanche incidents are triggered by a victim or someone with the victim.
- Avalanches can reach speeds of approximately 129 kilometers per hour (80 miles per hour) within five seconds.
- Avalanches are most common during and in the 24 hours after a storm dumps 30.5 centimeters (12 inches) or more of snow.
- Although many people believe that avalanches occur without warning, there are many precursors. Avalanches actually begin several hours or days before the snowfall, because previous snowfalls may have already weakend the layers below.
- If you are caught in an avalanche, it's best to try to "swim" to the surface.
- If dug out within 15 minutes, about 93% of avalanche victims survive.
Term Part of Speech Definition Encyclopedic Entry avalanche Noun
large mass of snow and other material suddenly and quickly tumbling down a mountain.
Encyclopedic Entry: avalanche slab avalanche Noun
dangerous slide of snow that falls as a large, flat whole (slab).
slant, either upward or downward, from a straight or flat path.
sluff avalanche Noun
small slide of loose snow.