Environmental Science
Night time temperatures rarely drop below the dew point temperature because

The dew will absorb all the heat
Both (b) and (c)
Saturation vapor pressures always increase at night
At saturation, latent heat of condensation is released into the air

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Sunrise and sunset
Minimum and maximum temperature for a day
Time of maximum solar radiation and the time of maximum temperature
Minimum and maximum solar energy received at the surface for a given day
Time of minimum temperature and the time of maximum solar radiation

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