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Which conditions are necessary for clouds to form?
warming air and relative humidity
cooling air and high humidity
cooling air and surfaces for condensation
warming air and surfaces for condensation
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GPT-5 mini
AI
Clouds form when moist air becomes saturated (RH reaches 100%) and water vapor condenses onto tiny aerosol particles (condensation nuclei). That usually requires the air to cool (e.g., by rising) and the presence of surfaces for condensation.
So the best choice is: "cooling air and surfaces for condensation." (Cooling to high relative humidity is also required — i.e., both saturation and condensation nuclei are needed.)
So the best choice is: "cooling air and surfaces for condensation." (Cooling to high relative humidity is also required — i.e., both saturation and condensation nuclei are needed.)
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