Q. The percentage of SO₂ produced by volcanoes is

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Q. Synthetic organic pesticides formulated nowadays are more than

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Q. The word smog is the combination of smoke and

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Q. The amount of carbon dioxide in the atmosphere

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Q. Water covers earth surface more than

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Q. Gases produced in leachate are

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Q. Term ozone hole is used for depletion of ozone during months of

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Q. The largest recycled item is

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Q. The main source of air pollution is

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Q. Eleven elements made part of earth mass

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Q. The amount of argon in the atmosphere

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Q. Half of the mass of atmosphere is present in lower part of it in

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Q. Water is made disinfectant during purification of water in the step

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Q. The waste products are given out from chimneys, automobiles produce pollution

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Q. The elevated concentration of metals causes clogs of gills in fish

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Q. Reducing smog contains

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Q. The residence time of NO and NO₂ in atmosphere are respectively in days

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Q. Acidification of soil can leach metals

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Q. Paddy fields produce significant amount of gas

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Q. Mean residence time of methane in atmosphere in years is

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