Why do avalanches happen?
The abominable snowman gets angry
Some snow is too slippery to stay put
Buried weak snow layers collapse

	What conditions cause avalanches?
Warm days, cold nights
Too much wind
Any number of weather conditions

	How do avalanches flow?
Like a frictionless liquid
Like a solid block of matter
Like a fluffy air-filled cloud

	What is the most likely avalanche trigger?
A person shouting
A low-flying helicopter
A person skiing