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

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

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Environmental Science
The wind direction is:

The direction to which the wind is blowing
The direction from which the wind is blowing
Always directly from high toward low pressure
Always directly from low toward high pressure

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