Evaporation is the reason for formation of clouds. But precipitation is the reason for rain.
What are clouds?
Clouds are big balls of cotton like structure.
They are formed when water vapor become saturated and covert into water droplets and fog.
The clouds are formed due to evaporation.
But rain happens when precipitation occurs.
The moisture in clouds have become so heavy that they drop in the form of rain.
Thus, Clouds are formed without rain because there are different process for rain and formation of clouds.
Learn more about clouds, here
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