Snowflakes are just ice crystals stuck together. The recipe is very simple: One oxygen atom and two hydrogen atoms, add cold temperatures and you get ice. This seemingly trivial structure however is full of surprises, as no crystal is the same as another, ever!
Science differentiates between twelve different types of ice in our universe. On Earth only one type of ice exists, the one we all know and it can float on water. Ice on Earth has many faces: Ice streams at the poles, glaciers in the high mountains, permafrost, frozen waterfalls, snow, hoarfrost, hail, Jack Frost on the windows…
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