Snow

Snow is precipitation in the form of crystalline flakes that falls from clouds. Since snow is composed of small ice particles, it is a granular material. Water snow has an open and therefore soft, white, and fluffy structure, unless subjected to external pressure. Snowflakes come in a variety of sizes and shapes. Types that fall in the form of a ball due to melting and refreezing, rather than a flake, are known as hail, ice pellets or snow grains.

Types of snow
While originally the word "snow" was used exclusively for frozen crystalline flakes of water, the definition has expanded to include all types of crystalline precipitation from elemental tellurium and lead sulfide, through Carbon Dioxide.