How snowflakes get their shapes | Earth | EarthSky
Depending on the temperature and humidity of the air where the snowflakes form, the ice crystals can grow into a myriad of different shapes.
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If you're a snow fan, you can enjoy some snow on your computer or iDevice desktop for Christmas wherever you live, and the great thing about virtual snow is that you don't have to shovel or plow it! There are more snow applications for Apple devices than you might imagine.