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Question
Classify the following pollutions into natural and man-made categories.
Sewage, dust, pollen grains, chemical fertilizers, vehicular smoke, algae, pesticides, waste of animals and birds.
Solution
| Pollutant | Category |
| Sewage | Man-made |
| Dust | Natural |
| Pollen grains | Natural |
| Chemical fertilizers | Man-made |
| Vehicular smoke | Man-made |
| Algae | Natural |
| Pesticides | Man-made |
| Waste of animal and plants | Natural |
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Complete the crossword puzzle with the help of clues given below :
Across
1. Pollutant which was used in refrigerators and air conditioners. (18)
3. Produced on incomplete combustion of fuels (14)
6. This chemical protects our crops and is washed into water bodies from the field. (9)
Down
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5. Disease which is caused by drinking contaminated water. (7)
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