81. The word Tsunami is derived from two Japanese words
82. The proper order from shortest to longest wavelength is:
83. DDT is a ______________ pollutant
84. Noise is _______________
85. What is UNCED?
86. What is the official name of IUCN?
87. What is the most important factor for the success of animal population?
88. _________ is the element used to produce nuclear energy
89. Carbon dioxide is called greenhouse gas because it is
90. Which of the following enhances soil fertility?
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