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

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

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Environmental Science
When a liquid thermometer is held in direct sunlight,

It will accurately measure the air temperature
It will measure the temperature of the sun rather than the air
It will measure a much higher temperature than that of the air
It will measure a much lower temperature than that of the air

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