Chemistry · Environmental Chemistry
वायुमंडल में ओजोन का स्तर किस दशक में पहली बार तेजी से कम होना शुरू हुआ था?
- 11980 के दशक में✓
- 21970 के दशक में
- 31960 के दशक में
- 41950 के दशक में
सही उत्तर देखें
1980 के दशक में
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