Snow consists of water vapor particles which then cool in the upper air falling to the earth as soft, white, and like soft crystals of snowflakes.
At a certain temperature (called freezing, 0 ° Celsius, 32 ° Fahrenheit), ordinary snow melts and disappears. The process when snow / ice turns directly into water vapor without melting is called sublimation. The process of the opponent is called deposition. When the snow freezes, it often becomes small fragments called “snowflakes”.
In the world, snow is common in subtropical and temperate countries.