Clouds are formed by water vapor rising into colder regions of the atmosphere and condensing, and steam is water vapor produced by evaporation. Given these facts, clouds are formed by what going to colder regions among the following options:
- Movement of an air mass
 - Something that evaporated
 - Something that melted
 - cloudy and rainy weather
 - Something that stayed the same
 - Something that froze
 - precipitation
 - air mass over Earth's surface


 

  Something that evaporated       