Correct Answer - Option 2 : Slab
Avalanches: An avalanche can be simply defined as a mass of snow that moves quickly down a mountain.
|Type of snow
- They are common on steep slopes and are seen after a fresh snowfall.
- Since the snow does not have time to settle down fully or has been made loose by sunlight, the snow-pack is not very solid.
- Such avalanches have a single point of origin, from where they widen as they travel down the slope.
- Loose Snow Avalanches in turn could cause a Slab Avalanche, which is characterized by the fall of a large block of ice down the slopes.
- Thin slabs cause fairly small amounts of damage, while the thick ones are responsible for many fatalities.
- Slab avalanches are the most dangerous type and responsible for more than 90% of the deaths that occur in avalanches.
- A mix of the other forms, Loose Snow and Slab.
- The bottom half of this avalanche consists of a slab or a dense concentration of snow, ice, and air.
- Above this is a cloud of powdered snow, which can snowball into a larger avalanche as it progresses down the slope.
- The speed attained by this avalanche can cross 190 miles per hour and they can cross large distances.
- These are quite dangerous as they travel slowly due to friction, which collects debris from the path fairly easily.
- The avalanche comprises water and snow at the beginning, but understanding avalanches have shown us that it can pick up speed with ease.
From the above discussion, we can say that Slab avalanches are most destructive in nature.