Question

Fog is formed by

• A. Smoke
• B. Condensation of water vapours
• C. Condensation of water vapours over dust particles
• D. Both A and C

Answer 1

The correct option is C Condensation of water vapours over dust particles

When there is temperature difference between the land and the atmosphere, and the land is also having low temperature, then the condensation of the water droplets/water vapours can begin near the surface. The condensation process occurs around the dust particles present in the air, so the dust particles provide nucleation for fog formation. Smoke and dust forms the haze. Smoke, dust and water droplets form the mist. Hence, the correct answer is ‘Condensation of water vapours over dust particles’.