An important reason for the large daily temperature range over deserts is
a. ?there is little water vapor in the air to absorb and re-radiate infrared radiation.
b. ?the light-colored sand radiates heat very rapidly at night.
c. ?dry air is a very poor heat conductor.
d. ?free convection cells are unable to form above the hot desert ground.
e. ?the ozone content of desert air is very low.
ANSWER: a
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