Environmental Science
What is the cause of the Exxon Valdez?

a plane which crashed and caused death of human life
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
none of these.

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Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

Release of latent heat to the atmosphere when polar ice melts
Concentration of earth's magnetic field lines at the poles
The insulating properties of snow
Circulation of heat by the atmosphere and oceans
Conduction of heat through the interior of the earth

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