61. Condensation nuclei may be:
62. _______ is an example of "bottom feeders".
63. Moisture in the air is known as
64. "Smog" is a mixture of
65. The major pollutant from automobile exhaust is
66. Nitrogen oxide and hydrocarbons released by automobiles interact to form
67. The Expansion of SPCA
68. Deforestation generally decreases
69. What is Canopy?
70. The presence of solid, liquid or gaseous compounds, which may not be normally present, or in excess concentration in the atmosphere is called
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