Avalanches

The video explains how avalanches form in mountainous areas due to weak snow layers and heavy snowfall. It distinguishes between slab and powder avalanches based on snow type. Monitoring weather conditions helps predict avalanches, while safety measures like barriers and controlled avalanches aim to minimize damage. Despite precautions, most avalanches are accidentally triggered by humans, especially skiers and snowboarders.

What can cause overhangs of snow to collapse in mountainous areas?

• Their own weight

• Strong winds

• High temperatures

• Animal movements

What is a characteristic of a powder avalanche?

• It moves in large chunks

• It forms from wet snow

• It is slower than a slab avalanche

• It breaks up into fine particles

How do avalanches gain momentum as they move down a slope?

• By losing snow

• By slowing down

• By picking up more snow

• By melting snow

What is one method used to prevent avalanches in high-risk areas?

• Building snowmen

• Erecting safety barriers

• Planting trees

• Using snowplows

What percentage of avalanches are accidentally triggered by humans?

• 100%

• 90%

• 70%

• 50%