The "BANG" is simply caused with some friction and a little bit of chemistry...
Under the bright wrapping is the cardboard tube and in that tube are... two cardboard strips. Now for the interesting part!
Every snowflake begins with a dust or pollen particle...
when that particle comes into contact with water vapour high up in the earth's atmosphere, there you have the little crystal bead of a snowflake.
Now this snowflake is heavier than air making it fall. As it falls through the air, more water vapour freezes onto the snowflake. Every snowflake forms a hexagonal shape and will continue to grow on those edges. (Its hexagonal beginning shape comes from the atoms). This snowflake will continue to grow as it falls down to earth.
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