Multiple choice

When moist air meets cold surface of earth, some of the water vapours condense on the particles of dust in air. It is called

  1. dew

  2. fog

  3. mist

  4. cloud

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fog forms when moist air comes into contact with a cold surface near the ground, causing water vapor to condense on dust particles. This distinguishes fog from mist (lighter), dew (condensation on surfaces), or clouds (higher altitude).