Understanding Avalanches

The video explains avalanches, which are sudden snowfalls from mountain slopes, common in areas with heavy snow. It discusses the conditions that lead to avalanches, such as slope gradient, snowfall, and climate. The formation process involves layers of snow and ice, creating a plane of weakness. Natural events like earthquakes can trigger avalanches, but shouting cannot. Avalanches often occur in the same locations due to local conditions, and can be managed with controlled explosions.

What are the three main factors that make avalanches likely to occur?

• Humidity, air pressure, and wind speed

• Altitude, wind direction, and temperature

• Slope gradient, snowfall degree, and climate

• Wind speed, temperature, and humidity

What happens to the snow when temperatures are mild after a heavy snowfall?

• It evaporates into the air

• It becomes compact and hard

• It melts and forms a layer of water

• It turns into ice immediately

What is the role of the ice layer in the formation of an avalanche?

• It strengthens the snowpack

• It prevents snow from melting

• It acts as a plane of weakness with low friction

• It increases the friction between snow layers

What can cause the upper layer of snow to collapse and trigger an avalanche?

• An increase in humidity

• A decrease in temperature

• The presence of strong winds

• The snow reaching a critical mass

Which natural events can trigger an avalanche by shaking the ground?

• Tornadoes and cyclones

• Thunderstorms and hurricanes

• Earthquakes and volcanoes

• Floods and landslides

Is it possible to trigger an avalanche by shouting in the mountains?

• Yes, it is a common cause

• No, it is a popular myth

• Only if the snow is very unstable

• Yes, but only in certain conditions

Why do avalanches tend to occur in the same places repeatedly?

• Because of consistent local conditions

• Due to the presence of wildlife

• Due to changes in weather patterns

• Because of human activity

How can avalanches be managed safely in certain areas?

• By diverting water flow

• By planting trees

• By using man-made explosions

• By building barriers