Environmental Science
_________ is a practice of clearing and burning the forest area for cultivation of crops for 3-4 years and shifting.

Horticulture
Taungya cultivation
Agrisilviculture
Jhum cultivation

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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:

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

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