81. The areas where soil is washed away into streams, transported into rivers and finally lost to the sea are called
82. The crack marked on a glacier due to splitting of ice is called
83. The conversion of ammonia to nitrate is known as ________
84. Air pollution is severe in
85. Which of the following provides a measure of the average speed of air molecules?
86. Which of the following determine the kind (wavelength) and amount of radiation that an object emits?
87. Which one of the following is the most stable ecosystem?
88. The type of ecosystem with the highest mean plant productivity is
89. Carbon sequestration is a strategy used to control
90. Wild life is continuously decreasing. What is the main reason of this?
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