Which sequence is most scientific in the process of precipitation from clouds?

Correct answer: Moisture → cooling → condensation → droplet growth → falling

Correct answer: A. Precipitation begins with moisture in the atmosphere. When moist air rises or is otherwise cooled, its temperature may reach the dew point and water vapour condenses on suitable nuclei, producing cloud droplets or ice crystals. These particles must then grow through condensation, collision and coalescence, or ice-crystal processes. Once they become sufficiently large and heavy, gravity makes them fall from the cloud. The falling particles may reach the ground as rain, drizzle, snow, sleet, or hail depending on their state and the temperatures they pass through. B, C, and D do not describe the atmospheric sequence: they mix geological, surface, or unrelated processes and omit the essential link between cooling, condensation, particle growth, and falling. The word “moisture” is the starting material, not the final precipitation itself. Memory cue: cool moist air, condense, grow, fall.