Working Model For Green Energy

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Please give me some ideas for making a working model 4 science exhibition class 10?

1. Green energy
2. Biology in human welfare .
3. Climate change
these r the topics 4 my project .

1. windmill
2. graphite is the good conductor of electricity.
3. solar cooker.
4.security alarm.
5. volcanic eruption.
6. renew use of water

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