Which type of fog is formed when cold air meets a warm water surface?

• A. Evaporation Fog
• B. Advection Fog
• C. Upslope Fog
• D. Radiation Fog

Answer: (A)

Evaporation fog occurs when cold air moves over a warm water surface, causing the moisture to evaporate into the air. As the water vapor rises, it cools and condenses into tiny water droplets, forming fog. This type of fog is commonly seen over lakes and rivers, especially on cold mornings when the air temperature is significantly cooler than the water temperature.

In contrast, the other types of fog mentioned involve different processes: Advection fog forms when warm, moist air flows over cooler ground or water, cooling the air and leading to condensation; Upslope fog occurs when air is forced to rise over elevated terrain, cooling and condensing as it ascends; Radiation fog is formed through the cooling of ground at night, which cools the air directly in contact with it, leading to condensation. Each type has distinct conditions for formation, with evaporation fog specifically linked to the interaction between cold air and warm water.