The Topic: 

Easier - Snow is frozen water that falls from the sky. All snow flakes have six sides, but no two snow flakes are the same.
Harder - Snow is precipitation in the form of small white ice crystals. Snow is formed from the water vapor in the air at a temperature of less than 32 degrees Fahrenheit.
Extreme Snow at Discovery Online
Here are facts, photos, and a quiz about snow and the devastating effects of severe snowfalls.
Ice and Snow from Dragonfly Magazine
Learn about ice and snow and how to make an igloo and your own 'virtual' snowflake.
Kids Snow Page
This site features activities about snow. It includes activities relating to science, art, literature, and food.
National Snow and Ice Data Center (NSIDC)
This site is for older, more advanced learners ready to investigate snow and ice. The many images in the photo gallery include glaciers, icebergs, ice shelf, and much more.
Not-To-Be-Missed Section:
2) Questions and Answers About Snow
 Explore snow by competing one or more of the following activities.
Complete Snow Activities. Visit the Billy Bear's Winter Activities for lots of snow activities for all ages.
Come Face to Face with a Major Winter Storm. Go to Blizzard Attack! and complete and involve yourself in the online simulation calling for decisions about winter weather.
Write a Snowflake Story. After visiting sites like (1) How do Snowflakes Form? and (2) Ice and Snow; write a short story about a snowflake. Imagine! As an alternate activity, you could write a snowflake poem. Illustrate it with your own snowflake artwork.
Make Snowflake Finger Puppets. Find some ideas for this activity at Snowflake Fun
Make Paper Snowflakes. Visit sites like (1) Paper Snowflakes for Everyone and (2) Dave's Snowflake Page to get ideas and instructions.
Sites By Kids For Kids
Snowtastic Snow (1998 ThinkQuest Junior Project)
Explore lots of snow information; the science of how it's made, winter safety, and more! This site is a 1998 award-winning ThinkQuest Junior site.
Snowstorms (2000 ThinkQuest Internet Challenge)
Snow is a beautiful thing - waking up in the morning to find the countryside covered in a pure white blanket of snow. However, snowstorms, or blizzards, can also be dangerous; find out what you can do to prepare yourself!
Snow (Part of Wicked World of Weather, 1996 ThinkQuest Project)
Find out about the mechanics, the elements, and the danger of snow.
More Snow Sites
Building an Igloo (Ben Meadows Company)
Here are the directions for building an igloo, including a warning.
How do Snowflakes Form? (Lansing State Journal)
The site has a brief article describing what causes snowflakes to form.
Related Websites:
2) Beautiful Science of Snow at the Christian Science Monitor
3) How Do Snowflakes Form
4) How Does A Cloud Rain?
4) The Life History of a Snowflake
Snow as a Resource by D. R. Powell 
Here you can see 100 pictures of snow and the effects of snowfall.
Snow Booklet
This page promotes the book, but also offers a few interesting facts about snow and snowfall in the U.S.
Snow Crystals
The many facets of snow crystals are described here, along with attempts to understand their formation.
Related Websites:
2) Basic Shapes of Snow Crystals
This brief site had good information about ice crystals.
Why Do Snowflakes Crystallize Into Such Intricate Structures? from Scientific American
Scientist C. A. Knight explains the formation and structure of snowflakes.
Wilson Snowflake Bentley: Photographer of Snowflakes
Learn about the life and work of an unusual man, Wilson A. Bentley, the snowflake man.
Websites For Teachers
Let it Snow! by J. Goodwin
Students will learn about and make snowflakes. Visit the snowflake 'Hall of Fame.'
Make It Snow by J. Keeler & C. Ashbridge (Grade 6)\Units\2nd\jkeelelu2.htm
This unit plan employs a variety of Caldecott Award and Honor books that depict snow and include images photographed by Wilson Bentley. Students examine snow from the viewpoint of art, geometry, and literary expression.
No Flakes Like Snowflakes!
Students explore snowflakes from the inside by making their own.
Learn about and join this collaborative online project that investigates snow. In the winter of 2001, this ongoing project will become a student-managed activity from Crossroads Elementary School .
Snow Density Experiment at SnowSchool (Grade 2-6)
A complete lesson with handout, learning goals and background information
Another SnowSchool Experiment:
2) Snow Melting Experiment (Grade 2-6)
Snowstorms in the Classroom from How Stuff Works
Let's find out how and why some regions in the United States get more than 100 inches of snow year after year.
Stop by the Web on a Snowy Evening at Education World
Here are snow lessons and activities for all ages!
Snow Project
This website guides the study of snow.
Snow Science Art (Grade 1)
Students use four different mixtures to draw snow crystals.
snow drift
snow fence
snow survey
snow job
snow pack
snowed in
snow machine
snow ice cream
snow day
snow goose
snowshoe hare
snowy owls
snowy egret
Snow White
snow line
snow shower
snow squall
snow flurry
snow advisory
snow cover
Created by Annette Lamb and Larry Johnson. Updated by Nancy Smith 6/01.