Environmental Science
As the difference between the air temperature and the dew point increases, the relative humidity:

Remains constant and equal to 100%
Increases
Remains constant at a value less than 100%
Decreases

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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 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
The thermometer was in error

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