How are clouds formed?
Answer: When air containing water vapour from the earth’s surface becomes lighter and rises, the air expands in volume due to lower air pressure there. As a result, the volume of that air decreases. Moist air becomes saturated as the temperature drops below the dew point. Then the water vapour in the air accumulates on the dust particles floating in the air and floats in the form of water droplets. Many such water droplets gather together to form clouds.