Clouds, fog, or dew will always form when: A. Air reaches the complete saturation point. B. Water vapor is present. C. The temperature and dew point are equal.

The dew point refers to the point at which temperature of the air reaches 100% saturation. When it gets to this point, the air condenses into water droplets, which we see as fog. Clouds are created when moist air cools down and expands in the atmosphere, the water vapor in the air are condensed to form water droplets which are the basis of clouds.

However all formations from the above involve water vapor.

fichoh fichoh · Answer 2 · 2020-03-05T06:00:14+01:00

Answer: A. When air reaches the complete saturation point

Explanation: Air is said to have attained a complete saturation point when air is no longer able to absorb moisture. When Evaporation occurs which is the vaporization process which occurs on the surfaces of liquid such as rivers and other water bodies usually due to heating. The evaporating liquid or moisture is continually added to air which condenses to form cloud, until it becomes saturated and can no longer hold additional moisture which is then converted into dew or fog.