CBSE Class 9 - Natural Resource - Air Videos

• draw a diagram in air the breathe of life
• why doesn,t the level of oxygen in the atmosphere decrease
• 1) How is greenhouse effect and global warming related? Explain 2) Give any three human activities that would that are responsible for depletion of Ozone Layer.
• who discovered nuclear weapons
• What is natural resources?
• Who is more poisonous among sulphur dioxide and carbon monoxide?
• What is natural resources
• What is natural resources
• when does this fog disappear
• What is Science?

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