Environmental Science
The earth's radiative equilibrium temperature is:

The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The temperature at which rates of evaporation and condensation on the earth are in balance
The average temperature the earth must maintain to prevent the oceans from freezing solid
The temperature at which the earth is radiating energy at maximum intensity

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

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

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