Environmental Science
The sun emits its greatest intensity of radiation in:

The ultraviolet portion of the spectrum
The x-ray portion of the spectrum
The infrared portion of the spectrum
The visible portion of the spectrum

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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 clouds are better conductors of heat than is the clear night air
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

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