ASC Avalanche Formation & Terrain Recognition 3

Question 1

Which avalanche type is characterized by a single point of origin that fans out in a triangular shape as it descends?

Accepted Answer

Loose-snow avalanche

Answer

Loose-snow avalanches start at a single point and widen as they gather more snow, forming a characteristic inverted-V or triangular shape.

Question 2

What is the typical critical slope angle range where most slab avalanches release?

Accepted Answer

30–45 degrees

Answer

Most slab avalanches release on slopes between 30 and 45 degrees, where gravitational stress exceeds the snowpack's strength most efficiently.

Question 3

A persistent slab avalanche problem is particularly dangerous because:

Accepted Answer

Buried weak layers can remain reactive for weeks or months after burial

Answer

Persistent weak layers can be re-activated long after they are buried, remaining a hazard even when surface conditions seem stable.

Question 4

What does a 'shooting crack' propagating away from your ski or board mean?

Accepted Answer

The slab is fracturing and conditions are highly unstable

Answer

Shooting cracks are a critical red flag indicating that slab layers are fracturing and propagating, signaling imminent avalanche danger.

Question 5

What term describes an avalanche that occurs when the entire snowpack slides on the ground surface?

Accepted Answer

Glide avalanche

Answer

Glide avalanches occur when the full snowpack moves along the ground, often over smooth rock or grass, and can release with little warning.

(ASC) Avalanche Safety Certification Practice Test