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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