Each snowflake is made up of about 180 billion water molecules. As water freezes, it changes to frozen crystals. At different temperatures, different crystal shapes form. The crystals stick together and form a snowflake. Air currents move a snowflake on its own path through a cloud. Each different path leads to a unique shape for each snowflake.

To learn more about how snowflakes form:

1. Go to the No Two Alike WWW Sheet and print it.

2. Visit this Web site. Then complete the WWW Sheet.
    Basic Shapes of Snow Crystals