Snow is a common precipitate formed when water vapor in the atmosphere cools sufficiently to deposit directly as ice crystals, rather than falling as liquid water. Its physical structure varies greatly depending on the temperature profile and atmospheric conditions, ranging from delicate stellar dendrites to dense, crystalline aggregates. The process of formation involves crystal growth, sedimentation, and metamorphism, which alters the snowpack's properties over time, affecting everything from its insulating capacity to its role in surface hydrology. When settled, the accumulated snowpack acts as a significant storage reservoir for freshwater, influencing seasonal runoff patterns and contributing to ground insulation in terrestrial and aquatic environments.