Environmental Science
The areas where soil is washed away into streams, transported into rivers and finally lost to the sea are called

Ecologically sensitive areas
Biologically sensitive areas
Grasslands
Delta

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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:

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

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