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Question

An avalanche is a type of which one of the following disasters ?

This question was previously asked in
CDS II 2021 General Knowledge Previous Year Paper (14-Nov-2021)
The correct answer is

Terrestrial

Understanding Avalanche Disasters

The question asks to identify the correct category for an avalanche among different types of natural disasters.

Defining an Avalanche

An avalanche is essentially a rapid flow of snow down a slope. It typically involves a large mass of snow, ice, and sometimes other debris, such as rocks or trees, cascading down a mountainside or steep incline. Factors like heavy snowfall, rapid temperature changes, or vibrations can trigger an avalanche.

Categorizing Natural Disasters

Natural disasters are often classified based on their origin. Let's look at the options provided:

  • Atmospheric Disasters: These relate to phenomena occurring in the Earth's atmosphere. Examples include storms, hurricanes, tornadoes, and droughts.
  • Terrestrial Disasters: These originate from or occur on the Earth's land surface. This category includes geological events like earthquakes, volcanic eruptions, landslides, sinkholes, and avalanches, as they involve the movement of material across land.
  • Aquatic Disasters: These are related to water bodies like oceans, seas, and rivers. Examples include floods, tsunamis, and oil spills in water.
  • Biological Disasters: These are caused by living organisms. Examples include epidemics, pandemics (like influenza or COVID-19), and major pest infestations that damage crops or ecosystems.

Classifying the Avalanche

An avalanche involves the movement of snow down a slope. Since the slope is part of the Earth's landmass, the avalanche is considered a movement occurring on the land. Therefore, it falls under the category of terrestrial disasters.

While atmospheric conditions (like heavy snowfall) are often prerequisites for an avalanche, the event itself is a mass movement occurring on the terrain.

Conclusion

An avalanche is classified as a terrestrial disaster because it is a phenomenon involving the rapid movement of snow and ice down a land slope.

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