Environmental Science
Particulate pollutants are

are small solid particles and liquid droplets
liquid droplets in atmosphere
all of these
are small solid particles released into the atmosphere

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

There is little water vapor in the air to absorb and re-radiate infrared radiation
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
The ozone content of desert air is very low

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