Which is most likely to cause clouds to form in a previously clear sky?(1 point)

Answer 1

Clouds are most likely to form in a previously clear sky due to the cooling of air, which can occur through processes such as:

1. Radiational Cooling: At night, the ground loses heat, cooling the air above it, which can lead to condensation and cloud formation.
2. Frontal Lifting: The approach of a cold front can lift warm, moist air, causing the moisture to condense into clouds.
3. Humidity Increase: An increase in humidity, from local sources such as evaporation from water bodies, can also lead to cloud formation if the air becomes saturated.

Of these, the most direct common cause would be either a sudden drop in temperature (from cooling) or an incoming weather front (frontal lifting) that elevates and cools the existing warm, moist air.