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	Snow will form when the temperature on the top of the clouds is about  0° Celsius (or 32° Fahrenheit.)
	As snow falls, snowflakes join together to make bigger snowflakes.
	Snow can fall from any cloud.
	It won't snow if there aren't any clouds in the sky!
	At the North and South Poles, snow actually reflects heat into space. Layers of snow act like a mirror and the heat bounces off the snow and back into the atmosphere.
	Snow is an important source of water. When snow melts in the mountains, it provides water for streams, hydroelectric power plants, and irrigation reservoirs.
	Snowfall varies around the world. Some areas never see snow while in some regions it snows all the time. The heaviest snowfalls occur on the coastal mountains of British Columbia in Canada, the Rocky Mountains and the Sierra Nevada range in the United States, and the Alps in Italy and Switzerland.