MTTC Missed Topics Practice Test

Cloud formation occurs when which sequence happens?

Warm moist air rises; air cools as it rises; water vapor condenses and clouds form Clouds form only when the air reaches 0 degrees Celsius Clouds are caused by the sun's rays evaporating clouds Clouds form when air descends and warms

Correct Answer:

Warm moist air rises; air cools as it rises; water vapor condenses and clouds form

Explanation:

Cloud formation happens when warm, moist air rises, expands, and cools. As the air rises, pressure drops and the air expands, so its temperature falls. When it cools to the dew point, water vapor condenses onto tiny particles and forms cloud droplets that gather into a visible cloud. This rising-and-cooling sequence explains why clouds appear after heated, humid air rises or along weather fronts. It isn’t about reaching 0°C; clouds can form at many temperatures, and some involve ice crystals at lower temps. The idea that sunlight evaporates clouds would reduce cloud presence, not create it, and clouds don’t form when air descends and warms, since sinking air dries and prevents condensation.

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