How do snowflakes get their shape?

Not a lot of snow in Dallas this winter so far, but there’s still February to come.  Meanwhile, EarthSky.org has some interesting information on how snowflakes get their shape:

Snowflakes form in the atmosphere when cold water droplets freeze onto dust particles. Depending on the temperature and humidity of the air where the snowflakes form, the resulting ice crystals will grow into a myriad of different shapes.

Wilson Bentley (1865 – 1931) from Jericho, Vermont was the first person to capture photographs of snowflakes through the use of a microscope attached to a camera. Hiscollection of 5,000 snowflake images introduced many people to the astounding diversity of snow crystals.

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