Environmental Science
MoEF means

Ministry of Environment and Forests
Ministry of Forest and Energy
Ministry of Fuel and Energy
Management of Environment and Forestry

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

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
The clouds start convection currents between them

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