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The characteristic shapes and crystalline structure found in ice and snow are down to a number of variables.

Pressure, temperature and impurities can alter the way water molecules interact and therefore change the shape. Most importantly is the electrostatic attraction between the Hydrogen and Oxygen found in water.

The elements Hydrogen and Oxygen share valence electrons to form water, and as each water molecule has a strong chemical polarity, these molecules are highly attracted to each other, forming a uniform electrostatic bond.

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Q: Why the hexagonal shape always appear in the ice?
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