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  • All living beings on earth breath air. Where does it come from ? Will it become    exhausted after a few years? If so what would happen to all living things ?
  • Similarly think about water, soil and minerals.
  • Are these natural resources on earth limited? We use several materials in our day to day life like fuel, medicines , cosmetics etc, Have you made an attempt to find out whether they are natural or man made.
  • Make list of materials present in your house on a piece of paper and differentiate them in to natural and man made materials.

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