Environmental Science
The unit of pressure most commonly found on a surface weather map is:

Inches of mercury (Hg)
Pounds per square inch
Millibars or hectopascals
Millimeters of mercury (Hg)

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

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 formation of the clouds releases latent heat energy
The clouds start convection currents between them
The clouds absorb and radiate infrared energy back to earth

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