Identifying Natural Disasters: Mass Mountain Movement

The question asks to identify the natural disaster involving the mass movement of snow, ice, and rock down a mountain. Let's analyze the options:

Option Analysis

• Tsunami: This is a large ocean wave, usually caused by earthquakes. It does not involve the movement of snow, ice, or rock down a mountain.
• Avalanche: This term specifically describes a rapid flow of snow down a slope. Avalanches often entrain ice and rock, fitting the description of mass movement of snow, ice, and rock down a mountain perfectly.
• Landslide: While landslides involve the movement of earth materials down a slope, they typically refer to soil, rock, and debris. The question specifically mentions snow and ice, making 'avalanche' a more precise answer for this context.
• Cyclone: This is a type of storm characterized by rotating winds. It is a meteorological phenomenon and does not involve the described mass movement.

Conclusion

Based on the definition provided in the question, an avalanche is the natural disaster characterized by the mass movement of snow, ice, and rock down a mountain.