Because it's cold ya silly billy!
Frost on the grass in autumn is an example of
Ground frost or hoar frost.
Frost is a form of precipitation that occurs when water vapor in the air freezes onto surfaces like grass, cars, and windows. It usually happens on clear nights when the temperature drops below freezing.
Frost or frozen dew that forms a white coating on objects. It's usually distinguished from the general word frost in that frost can form in a refrigerator, for example, but hoarfrost is frozen atmospheric condensate on such things as grass, leaves, etc.
Lettuce will not tolerate a frost.
The process of frost forming is called "frost formation" or simply "frosting." It occurs when water vapor in the air freezes directly onto surfaces like grass, cars, or windows when the temperature drops below freezing point.
Annual bluegrass
Hence,the formation of dew and frost is a physical change.
Frost conditions occur when the temperature drops below freezing, causing water vapor in the air to freeze on surfaces like grass, cars, and windows. Frost can form intricate patterns and can damage sensitive plants and crops. It is important to take precautions to protect against frost, such as covering plants or bringing them indoors.
Frost is a physical change, the condensation and freezing of water vapor.
The phase change is called deposition: water vapor changes directly to ice.
The singular possessive form of "Robert Frost" is Robert Frost's.