71. Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?
72. Nitrogen fixation is a process of
73. Greenhouse effect is caused by
74. The lowest layer of earth's atmosphere is
75. Earth’s atmosphere is an envelope of gases extending to a height of
76. Depletion of ozone layer causes
77. Nitrification is the biological process of converting
78. Besides CO2, the other green house gas is
79. The greenhouse effect is caused by the higher level of which gas in the atmosphere ?
80. The atmospheric gas that is mainly responsible for green house effect :
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