Snow is precipitation of a solid. Produced by sublimation of water vapor in the form of branched hexagonal crystals and stars, which are often mixed with simple ice crystals. At temperatures over 10 ° C the crystals are usually glued in thin flakes coated liquid water. Forms crystals are different and may appear in the form of hexagonal tiles, triangles, prisms, or as branched crystals. In meteorology is considered snow that day when at least half of the visible soil covered with snow cover. Snow cover is a poor conductor of heat; between individual crystals of snow has air, protecting the soil from excessive cooling and winter crops from freezing.
Uploaded: Oct 11, 2015