Avalanches occur when a layer of snow cannot support the weight above it, causing it to collapse and slide down a slope. This can be triggered by factors like heavy snowfall, rapid temperature changes, or disturbances such as human activity.
MCQs
1. What can trigger an avalanche?
A) A sunny day
B) A loud shout
C) Heavy rainfall
D) All of the above
Answer: D) All of the above
Explanation: Avalanches can be triggered by various factors, including a loud noise, heavy snowfall, rainfall, or even a change in temperature.
2. Which layer of snow is most likely to slide and cause an avalanche?
A) The top layer
B) The middle layer
C) The bottom layer
D) The layer closest to the sun
Answer: A.)The top layer
Explanation: The top layer of snow is often looser and can slide over a more compact layer beneath, causing an avalanche.
3. What is one of the main factors that determines the stability of snow on a slope?
A) The color of the snow
B) The temperature of the air
C) The steepness of the slope
D) The number of trees
Answer: C) The steepness of the slope
Explanation: The steepness of the slope is a critical factor in avalanche risk. Steeper slopes are more prone to avalanches.
4. How can human activities contribute to the occurrence of an avalanche?
A) Walking or skiing on unstable slopes
B) Singing loudly
C) Taking pictures
D) Eating food outdoors
Answer: A) Walking or skiing on unstable slopes
Explanation: Human activities, such as walking or skiing on snow-covered slopes, can disturb the snowpack and potentially trigger an avalanche.
Fill in The Blanks
Choose from These Words: slides, avalanches,avalanche-prone.
1. Avalanches occur when a layer of snow collapses and __________ downhill.
Answer: slides
2. Changes in temperature, snowfall, and the slope of the mountain can all contribute to the occurrence of __________.
Answer: avalanches
3. It is important to be cautious when skiing or snowboarding in __________ areas.
Answer: avalanche-prone
True / False
1. Avalanches only happen in the winter (True / False)
False: While avalanches are most common in the winter when there is a lot of snow, they can also occur in the spring or summer under the right conditions.
2. Avalanches are always caused by humans (True / False)
False: While human activity can sometimes trigger avalanches, they can also occur naturally due to factors like weather patterns and snow conditions.
3. Avalanches only happen on steep slopes (True / False)
False: While avalanches are more likely to occur on steep slopes, they can also happen on gentler terrain under certain conditions.
4 It is safe to play or ski in areas where avalanches have occurred before (True / False)
False: It is important to avoid areas where avalanches have occurred in the past, as they are more likely to happen again in the future.
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