Snow is formed when microscopic water droplets in clouds attracted to grains and freeze. The resulting ice crystals that initially does not exceed 0.1 mm in diameter, falling and rising as a result of condensation of moisture on them from the air. It formed six-crystalline form. Because of the structure of water molecules between the rays crystal possible viewing only 60 ° and 120 °. The main crystal water is in the plane form a regular hexagon. On the tops of the hexagon then settle new crystals on them following, and so the formation of various forms of snowflakes, stars. In high thermal columns repeatedly crystals partially melt and crystallize again. Because it breaks the regularity of crystals formed and mixed forms. Crystallization all six rays occurs simultaneously in almost identical conditions and therefore form separate beams snowflakes out the same.!