PDF chapter test TRY NOW
Fill in the blanks with the options given in the box below:
| Arsenic | Lead | Sulphur oxide |
| Oxygen | Nickel | Photosynthesis |
| Ozone | Increase | Methyl isocyanate |
| Nitrogen oxide | Absence | Convention currents |
| Sun | Cellular | Air pollution |
| Sulphur oxide | Convention currents | Nickel |
1. ________ gas is the major cause for acid rain.
2. The number of air molecules is less when there is _________ in height.
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