Fog near the ground and a cloud at height are mainly distinguished on what basis?

Correct answer: Height or location

Correct answer: C. Fog and cloud are both collections of tiny water droplets or, in some conditions, ice particles suspended in the atmosphere. Their main school-level difference is location. Fog forms at or very near the ground and can reduce visibility for people and vehicles at the surface. A cloud is the same broad type of condensed atmospheric moisture located above the ground at some height. If a cloud base lowers until it touches the ground, it is commonly described as fog. A is wrong because colour is not the defining distinction; both may appear white, grey, or darker depending on thickness and light. B is irrelevant and cannot be used for atmospheric classification. D concerns salt in ocean water, not the position of condensed moisture in the air. Memory cue: fog is a cloud at ground level. This does not mean every cloud is fog; height or contact with the ground is the key distinction in this question.