Dew is formed when water vapor condenses over night, and dew point is the temperature at which dew forms. Given these facts, what about the temperature may cause water vapor to condense overnight and in the early morning among the following options:
- It reaches the dew point
 - It reaches Kelvin point
 - Movement of an air mass
 - Warm air moving into cold air
 - It reaches evaporation point
 - Temperature changing
 - preventing heat transfer
 - It is too dark to measure


 

 It reaches the dew point        