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Identify a range of energy sources e.g. oil, coal, natural gas, solar, wind, water, nuclear, chemical, mechanical.

Four stroke engine #2
Four stroke engine #2
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Solar energy
Solar energy
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Power plant
Power plant
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Hydroelectric plant
Hydroelectric plant
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Fission
Fission
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Bicycle Gear Ratios
Bicycle Gear Ratios
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Transportation and Energy
Transportation and Energy
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Flashlight
Flashlight
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Nuclear fusion
Nuclear fusion
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Galvanic cell
Galvanic cell
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History of Transportation
History of Transportation
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Fuel cell
Fuel cell
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