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

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

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Environmental Science
What is the cause of the Exxon Valdez?

a plane which crashed and caused death of human life
none of these.
Oil Tanker which sank in 1989 along the coast of Alaska and marine life seriously affected.
a ship which wrecked on the coast of India

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