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 newspaper reported the wrong temperature
The thermometer was read before the minimum temperature was reached for that day

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Environmental Science
An important reason for the large daily temperature range over deserts is:

The light-colored sand radiates heat very rapidly at night
Free convection cells are unable to form above the hot desert ground
Dry air is a very poor heat conductor
There is little water vapor in the air to absorb and re-radiate infrared radiation
The ozone content of desert air is very low

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