Environmental Science
The gas responsible for the greenhouse effect on Venus is:

Nitrogen (N2)
Water vapor (H2O)
Carbon dioxide (CO2)
Ozone (O3)
Oxygen (O2)

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

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

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