Environmental Science
The primary source of energy for the earth's atmosphere is:

The sun
Lightning discharges associated with thunderstorms
Latent heat released during the formation of hurricanes
Energy from within the earth
Erupting volcanoes

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

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