Cool Knowledge:Snow Flakes

Snow is unique in that every tiny snowflake forms
itself around a very small speck of atmospheric dust,
a range of things from volcanic ash to space particles.
A snowflake's shape depends on different factors such as
temperature, humidity, speed of descent and wind.
Fresh snow is almost 95 percent air. This makes it a
an insulator. Think of snow cave's.

Snow isn't necessarily always white. Reports have told
of red, yellow, and black snow. This is rare and probably
caused by ash, pollen, or soot in the air.