Frost is frozen moisture. It forms when invisible water vapour in the air changes directly from a gas-like state into ice crystals. In mountains, moisture in cracks in rocks freezes at night. Because ice occupies more space than water, the ice exerts a wedge like pressure inside the cracks, widening them until the rocks split. This is called frost action.
Check Also
World Lupus Day: Date, History, Significance, Facts about autoimmune disease
World Lupus Day is dedicated to people worldwide who suffer from this debilitating autoimmune disease …