Rime is a type of frozen precipitation that forms on surfaces when the air temperature is below freezing. It is composed of tiny ICE crystals and can be found on trees, grass, and other surfaces. The term 'rime' can refer to four different types of frozen precipitation: HOARFROST, ICE, FROST, and HOAR. HOARFROST is a white deposit of ICE crystals formed by the rapid freezing of water vapor on objects exposed to the air. ICE is a solid form of water that has a crystalline structure and is usually transparent or translucent. FROST is a thin layer of ICE crystals formed when the air temperature is below freezing. Finally, HOAR is a type of FROST that forms on cold surfaces in calm, clear weather.