Question

multiple choice question
the formation of clouds depends largely on the presence of ______, even if other conditions are favorable for their development.
unstable nuclei
nitrogen
condensation nuclei
oxygen

Explanation:

Cloud formation occurs when water vapor condenses. Condensation nuclei, such as tiny dust, salt, or smoke particles, provide a surface for water - vapor molecules to attach to and start the condensation process. Without condensation nuclei, even if there is sufficient water vapor and favorable temperature and pressure conditions, cloud formation will be severely hindered. Unstable nuclei are related to radioactive decay and not cloud formation. Nitrogen and oxygen are major components of the atmosphere but are not the key factor for cloud formation like condensation nuclei.

Answer:

C. condensation nuclei