Powder snow avalanche in the Himalayas!

An avalanche also called a snowslide or snowslip, is a sudden, drastic flow of snow down a slope, occurring when either natural triggers, such as loading from new snow or rain, or artificial triggers, such as snowmobilers, explosives or backcountry skiers, overload the snowpack. First it is a mechanical phenomenon: The influence of gravity on the accumulated weight of newly fallen uncompacted snow or on thawing older snow leads to avalanches which may be triggered by earthquakes, gunshots and the movements of animals. Typically occurring in mountainous terrain, an avalanche can mix air and water with the descending snow. Powerful avalanches have the capability to entrain ice, rocks, trees, and other material on the slope. Avalanches are most common during winter or spring but glacier movements may cause ice avalanches during summer. Second it is a natural hazard: Avalanches cause loss of life and can destroy settlements, roads, railways and forests. Avalanches are primarily composed of flowing snow, and are distinct from mudslides, rock slides, and serac collapses on an icefall. Avalanches are not rare or random events and are endemic to any mountain range that accumulates a standing snowpack. In mountainous terrain avalanches are among the most serious objective hazards to life and property, with their destructive capability resulting from their potential to carry an enormous mass of snow rapidly over large distances.

Avalanches are classified by their morphological characteristics and are rated by either their destructive potential, or the mass of the downward flowing snow. Some of the morphological characteristics used to classify avalanches include the type of snow involved, the nature of the failure, the sliding surface, and the propagation mechanism of the failure, the trigger of the avalanche, the slope angle, slope aspect, and elevation. The size of an avalanche, its mass and its destructive potential are rated on a logarithmic scale, typically of 5 categories, with the precise definition of the categories depending on the observation system or geographic region in which the avalanche occurs.

The Himalaya Range or Himalaya Mountains, usually called the Himalayas or Himalaya, is a mountain range which crosses Pakistan, Nepal, Tibet, Bhutan and India. By extension, it can also refer to the massive mountain system that additionally includes the Karakoram, the Hindu Kush, and other lesser ranges that extend out from the Pamir Knot. Some of the world's major river systems arise in the Himalayas, and their combined drainage basins are home to some 3 billion people (almost half of the Earth's population) in 18 countries. The Himalayas have profoundly shaped the cultures of South Asia; many Himalayan peaks are sacred in Hinduism, Buddhism and Sikhism.

Geologically, the Himalayas originate from the northward movement of the Indian tectonic plate at 15 cm[citation needed] per year to impact the Eurasian continent, with first contact about 70 million years ago, and with movement continuing today. This caused the formation of the Himalayan arc peaks: the lighter rocks of the seabeds of that time were easily uplifted into mountains. An often-cited fact used to illustrate this process is that the summit of Mount Everest is made of marine limestone.

Source: Wikipedia

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