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Topic 01
Air
Ms. Jyoti Sharma
Topic 03
Holes in ozone layer and the probable damages
Ms. Jyoti Sharma
Topic 05
Oxygen
Ms. Jyoti Sharma
Topic 07
Nitrogen
Ms. Jyoti Sharma
Topic 02
Air, water and soil pollution
Ms. Jyoti Sharma
Topic 04
Bio-geo chemical cycles in nature: Water
Ms. Jyoti Sharma
Topic 06
Carbon
Ms. Jyoti Sharma
Class 9 Science
Chapter 14
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