If it’s a slide of snow that is able to begin from a point while it gathers speed and volume on its way, then it is an Avalanche. There is snow, air, and perhaps ice, trees, rocks, as well as other debris or objects coming its way in its mass. They seem terrific and are quite hazardous. The highest speed observed in some avalanches is about 175 miles per hour.
There is spontaneous emergence of avalanche when there is a storm that brings about numerous snowfalls. This leads to an increased load; however, it is possible to have it when there are changes in snowpack like melting, rock fall and commonly a fellow rider. It is noteworthy that many of the avalanches that occur in recreational areas are likely from the activities of the people.