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Complete the crossword puzzle with the help of clues given below:

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1. Pollutant which was used in refrigerators and air  conditioners. (18)  2. This layer protects us from harmful ultraviolet rays. (5)
3. Produced incomplete combustion of fuels. (14)    4. It is essential for combustion. (6)
6. This chemical protects our crops and is washed into water bodies from the field. (9)          5. Disease which is caused by drinking contaminated water. (7)
7. River which is famous in India and sustains most of the northern, central and eastern Indian population. (5)                 

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