avalanches
type: Concept
broader: natural disasters
broader: hazards and disasters
broader: geological processes
definition: Avalanches occur as rapid, gravity-driven accelerations of different materials downslope at high rates of speed. All avalanches are caused by an overburden of material that is too massive and unstable for the slope that supports them. [Source: Encyclopedia of Geography; Avalanches]

concepts
type: Collection
type: ConceptGroup
member: avalanches

geological processes
type: Concept
narrower: avalanches

hazards and disasters
type: Concept
narrower: avalanches

natural disasters
type: Concept
narrower: avalanches