91. Nitrogen gas returns to the atmosphere by the action of
						
					92. The most abundant gases in the earth's atmosphere by volume are:
						
					93. Cigarette smoking exposes one to __________
						
					94. Of the gases listed below, which is not believed to be responsible for enhancing the earth's greenhouse effect?
						
					95. The thickness of ozone layer is measured in 
						
					96. Exponential growth occurs when there is
						
					97. An increase in albedo would be accompanied by ____ in radiative equilibrium temperature.
						
					98. Many wild plant and animals are on the verge of extinction due to
						
					99. Most harmful environmental pollutants are  
						
					100. The destruction of the forest areas by man made efforts is called   
						
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