Avalanche

• An avalanche is a large amount of snow moving quickly down a mountain, typically on slopes of 30 to 45 degrees.
• When an avalanche stops, the snow becomes solid like concrete and people are unable to dig out.
• People caught in avalanches can die from suffocation, trauma or hypothermia.
• Avalanches can:
  • Be caused by people, new snow and wind.
  • Move at speeds of 100 to 130 km/h

Source: https://www.ready.gov/avalanche