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

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

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Environmental Science
During an equinox:

The days and nights are of equal length except at the poles
All of these
The earth is not tilted toward nor away from the sun
At noon the sun is overhead at the equator

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