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

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Environmental Science
The order of succession in a lithosere or xerosere is

Crustose lichen stage->Foilose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community)
Moss stage ->Foilose lichen stage-> Crustose lichen stage ->herb stage->shrub stage->forest stage (climax community)
Foliose lichen stage->Crustose lichen stage->moss stage->herb stage>shrub stage->forest stage (climax community)
Crustose lichen stage->Foilose lichen stage->moss stage-> ->shrub stage-> herb stage->forest stage (climax community)

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Environmental Science
When the air is saturated, which of the following statements is not correct?

The air temperature equals the dew point temperature
The air temperature equals the wet-bulb temperature
The wet bulb temperature equals the dew point temperature
An increase in temperature will cause condensation to occur
The relative humidity is 100 percent

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