Clouds form when water vapor in the atmosphere cools to its dew point and

Clouds are formed when water vapor reaches dew point and freezes.

Clouds are formed due to condensation process in which the water vapor present in the atmosphere consolidates into gas. As warm air ascends in the air, it cools.

When the air cools to its dew point which is temperature at which air arrives at immersion-water vapor gathers into tiny droplets. The weights of these droplets are light to the point that they either coast as cloud on rising air or fall gradually to the atmosphere.

answer; ///(true)/// fusion occurs in the sun's core;