Question

question 3
how are clouds formed?
clouds form when water vapor condenses around a particulate of dust, pollen or smoke
clouds form from nitrogen and oxygen moving in the stratosphere
clouds form when water changes form from a liquid to a solid
clouds form from carbon dioxide particles attaching to oxygen particles

Explanation:

Clouds are formed through the condensation of water - vapor. Tiny particles like dust, pollen, or smoke act as condensation nuclei around which water vapor condenses to form cloud droplets. Nitrogen and oxygen moving in the stratosphere do not form clouds. Water changing from liquid to solid is freezing and not related to cloud - formation. And carbon - dioxide particles attaching to oxygen particles is not how clouds are formed.

Answer:

Clouds form when water vapor condenses around a particulate of dust, pollen or smoke