What is the basic difference between a cloud and fog?

Question

What is the basic difference between a cloud and fog?

A. Fog is a cloud near the ground.

B. Clouds form when air is cooled, whereas fog forms when air is heated.

C. Clouds form when air is heated, whereas fog forms when air is cooled.

D. Clouds and fog are two words for exactly the same thing.

Answer 1

The right answer is (A).

The fog is a visible moisture that touches the ground and could be up to 50 feet high. The moisture that is at the height 50 feet and above we call a cloud.