Which fog types are produced by evaporation rather than cooling?

Steam and frontal fogs are both types of fog generated through the process of evaporation rather than cooling of the air.

Steam fog occurs when cold air moves over warmer water, causing water to evaporate into the colder air. The moisture condenses into tiny droplets, creating a fog that resembles steam rising from the water's surface. This process is directly tied to the evaporation of water, which contributes to the formation of the fog.

Frontal fog, on the other hand, forms when warm, moist air is lifted over a colder air mass, particularly in the context of frontal boundaries. As the warm, moist air rises, it cools sufficiently to allow for evaporation and condensation, contributing to the dense fog often associated with weather fronts.

In contrast, the other types of fog listed are primarily produced through cooling mechanisms. For instance, radiation fog forms through the cooling of the ground surface at night, causing moisture in the air near the ground to condense. Similarly, advection fog occurs when warm, moist air moves over a cooler surface, where cooling leads to condensation. Therefore, identifying steam and frontal fogs as those that result from evaporation captures the essence of how these specific fog types form.