geology forum 1 on Instagram: "AVALANCHE An avalanche is a rapid flow of snow, ice, and sometimes rock and debris, down a mountainside. It occurs when the forces acting on a mass of snow such as gravity—overcome the snowpack’s ability to resist movement. Avalanches are common in steep mountain regions and can be highly destructive, posing risks to human life, property, and the environment. TYPES OF AVALANCHES: 1. Loose Snow Avalanches: Begin from a single point and gather snow as they move down.