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One of the following factors does not lead to soil formation in nature (a) the sun (b) water (c) wind (d) polythene bags 5. The two forms of oxygen found in the atmosphere are (a) water and ozone (b) water and oxygen (c) ozone and oxygen (d) water and carbon-dioxide 16-04-2018. 80 EXEMPLAR PROBLEMS 6. The process of nitrogen-fixation by ...

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