Would you be surprised to see colored snow? Although snow itself is always white, it sometimes appears to be pink, brown, blue, or green! The most common cause of snow that seems colored is very small plants called algae, which have various colors.
Algae are the simplest of all plants. Many of them have neither roots nor stems. Some of these simple plants live in the air. When snow falls,algae in the air may be carried down with it. The plants are too minute to be seen separately. Only their color is visible. Because of this, it seems that the snow has changed color.
Another cause of colored snow is the red dust from sand storms. This dust is sometimes carried hundreds of miles through the air. High in the air, it mixed with snow. When the snow falls, there is sometimes enough red dust mixed in with it to give it a pink color. In 1933, for example, a dust storm took place. Later in the year, dust from that storm caused snow falling in New England to look pink.

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