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Snow Crystal Growth
Age 18 · Chemistry
Water vapor can skip the liquid state and attach directly onto an ice crystal. The molecules settle into a six-sided lattice, so the crystal grows with six-fold symmetry.
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In the picture
- The central six-sided ring of linked water molecules
- A new water molecule attaching at a corner of the ring
- A flat branching arm extending outward from the ring
- A drifting vapor molecule approaching the crystal
Examples
- Frost forming on a cold window
- Snowflakes seen on a winter coat sleeve
Key takeaways
- Water vapor can become solid ice without first becoming liquid.
- The ice lattice repeats six-sided order, producing six-fold snow crystal shapes.
Quiz: Snow Crystal Growth (Age 18)
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According to the card, what can water vapor do?
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Why do snow crystals grow with six-fold symmetry?
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Where does a new water molecule attach when the crystal grows?
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