character: Wind Energy in Physics
topic: Renewable Energy Sources: Wind Power
grade: 9
subject: Physics
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character: Solar Energy Applications
topic: Comparison of Renewable Energy Sources
grade: 9
subject: Physics
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character: Hydroelectric Power
topic: Applications and Importance of Water Energy
grade: 9
subject: Physics
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character: Geothermal Energy
topic: Other Renewable Energy Sources
grade: 9
subject: Physics
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