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

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
Sunrise and sunset

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Environmental Science
Suppose yesterday morning you noticed ice crystals (frost) on the grass, yet the minimum temperature reported in the newspaper was only 35o F. The most likely reason for this apparent discrepancy is that:

The thermometer was in error
The thermometer was read incorrectly
Temperature readings are taken in instrument shelters more than 5 feet above the ground
The thermometer was read before the minimum temperature was reached for that day
The newspaper reported the wrong temperature

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