PDF chapter test TRY NOW
Fill in the blanks with the options given:
| Arsenic | Lead | Oxygen | Nickel |
| Nitrogen oxide | Absence | Ozone | Increase |
| Photosynthesis | Methyl isocyanate | Saturn | Oxygen |
| Sulphur oxide | Convention currents | Cellular | Air pollution |
1. The sewage sludge incineration releases __________ air toxic.
2. In __________ of air combustion process ceases.
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