view colored snow is able to shock even those brave people like sailors.In the early 19th century sailing ship crew members, held near the coast of Greenland, we were struck by the sight of red snow.The first "bloody snow" in the narrow area between the rocks watchman noticed.Mariners swept superstitious fear, many have stated that "it is not good" and demanded to turn back.With barely suppressed panic among the crew members, the captain ordered the sailors to go more to the shore on the boat.As it turned out, the snow was the most common, but it is covered with a thin red film, which has nothing to do with blood.

This phenomenon can be observed not only in Greenland, but also in the Caucasus Mountains, as well as in Antarctica.Subsequ
ently, the researchers found that the culprit "bloody snow" is a snow chlamydomonas - microscopic algae pinkish-red color.This organism is not afraid of the cold, so well propagated on the surface of the snow.Depending on the number of individuals in a colony of algae, the color of snow can vary from pale pink to blood red.The presence of microscopic algae can change not only the color but also other properties of snow.For example, in 2006, residents of Colorado (USA) tried a snow taste, and it turned out that it resembles a watermelon.

Modern people colored snow seldom causes superstitious terror.More often it raises another question - whether it is an ecological disaster if there is a health hazard.That such questions to ask the residents of Tyumen, Tomsk and Omsk region 21 January 2007, when these regions fell unusual snow.Its color range from pale yellow to orange.Experts of Ministry of Emergency Situations conducted laboratory analysis of samples of snow, reassured the citizens: no harmful substances snow is not contained.At present it is only clay and sand dust raised into the air during a sandstorm in northern Kazakhstan and brought the wind in Western Siberia.

dust carried by the wind - the most common cause of loss of color of snow.Depending on the nature of the soil, the smallest particles of which were raised in the air, the snow can be yellow, brown or reddish.

In some cases, the unusual color of snow is related to industrial emissions the atmosphere - this was the cause of black snow which fell in 1969 in Sweden.It is still a mystery the cause of loss of green snow in California in 1955.The snow was poisonous - it caused an itchy rash on the skin, while those who took the snow in his mouth, soon died.The most probable cause is called the testing of nuclear weapons.