What are the two types of fog?

What are the two types of fog?

• A. Advection and Condensation
• B. Advection and Radiation
• C. Radiation and Advection
• D. Radiation and Condensation

Answer: (B)

Fog forms when air at the surface becomes saturated and water vapor condenses into tiny droplets near ground level. The two common forms are advection fog and radiation fog. Radiation fog appears on clear, calm nights when the ground loses heat to space and cools the air above it to the dew point; it often settles in valleys or low-lying areas and usually dissolves after sunrise as the surface warms. Advection fog happens when warm, moist air moves horizontally over a cooler surface, which cools the air to its dew point and creates fog that can extend inland from coastlines or over snow and other cool surfaces. The underlying idea is condensation at the surface, triggered either by radiative cooling or by the air being cooled as it moves over a colder surface.

Fog forms when air at the surface becomes saturated and water vapor condenses into tiny droplets near ground level. The two common forms are advection fog and radiation fog. Radiation fog appears on clear, calm nights when the ground loses heat to space and cools the air above it to the dew point; it often settles in valleys or low-lying areas and usually dissolves after sunrise as the surface warms. Advection fog happens when warm, moist air moves horizontally over a cooler surface, which cools the air to its dew point and creates fog that can extend inland from coastlines or over snow and other cool surfaces. The underlying idea is condensation at the surface, triggered either by radiative cooling or by the air being cooled as it moves over a colder surface.