Dew is formed by the direct condensation of atmospheric water vapor onto surfaces that have cooled to the dew point, whereas rain forms through cloud microphysical processes such as condensation or ice nucleation aloft followed by droplet growth and gravitational fallout. This distinction is a matter of basic meteorological fact and common knowledge requiring no citation.
The claim states that dew and rain have different meteorological formation mechanisms. This is a foundational, trivially true statement in meteorology (surface-level thermodynamic condensation versus cloud-level hydrometeor growth and precipitation processes). Per the instructions, statements that are trivially true by direct observation or basic scientific definition are COMMON_KNOWLEDGE, and no citations or papers should be attached to them.