Complete the crossword puzzle with the help of clues given below:
| Across |
Down |
| 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) |
