Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds absorb and radiate infrared energy back to earth
The formation of the clouds releases latent heat energy
The clouds are better conductors of heat than is the clear night air
The water droplets in the clouds reflect infrared energy back to earth
The clouds start convection currents between them

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Environmental Science
In a temperature inversion:

Air temperature remains constant with increasing height
It is warmer at night than during the day
Air temperature increases with increasing height
Air temperature decreases with increasing height

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