Avalanche Safety and Snow Properties

The video explains avalanches, focusing on slab avalanches, which are the most dangerous type. It discusses the mechanics of snow slabs, including the balance of stress and strength. Key factors influencing avalanches are terrain, snow pack, and weather. Snow's viscoelastic properties allow it to adjust to conditions but can lead to avalanches if stressed. Avalanches can be deadly, but safety measures at ski resorts help mitigate risks.

What is the primary reason slab avalanches are considered the most dangerous?

• They only happen in warm weather.

• They are caused by rain.

• They are unpredictable and hard to detect.

• They occur on flat terrain.

Which terrain slope is most likely to experience an avalanche?

• 10 degrees

• 20 degrees

• 45 degrees

• 70 degrees

What is a characteristic of a weak snow layer?

• It is formed by rain.

• It is granular and doesn't bond well.

• It has small round crystals.

• It is very dense.

How does sudden weather change affect snow packs?

• It stabilizes them.

• It has no effect.

• It makes them melt instantly.

• It can destabilize them.

What does it mean when snow is described as viscoelastic?

• It is neither solid nor liquid.

• It is always liquid.

• It behaves like a liquid and a solid.

• It is always solid.

Why can snow adjust to different conditions without collapsing?

• Due to its granular nature.

• Because it is always cold.

• Due to its viscoelastic properties.

• Because it is always dense.

What is the speed at which avalanches can travel?

• 100 MPH

• 30 MPH

• 10 MPH

• 60 MPH

What percentage of avalanches are triggered by the victim or their companions?

• 10%

• 70%

• 50%

• 90%

What precaution is sometimes taken at ski resorts to prevent avalanches?

• Building walls

• Triggering explosives

• Planting trees

• Using snow machines

What is a common-sense measure to avoid avalanche danger?

• Skiing alone

• Ignoring weather reports

• Skiing on steep slopes

• Staying off dangerous slopes