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

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

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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 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
The temperature at which rates of evaporation and condensation on the earth are in balance

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