uranium  - an example of nuclear fuel, radioactive - plutonium is a .... material., waves - ... are source of water power in the sea., nuclear - uranium and plutonium are .... fuels., solar - ... energy is energy from the sun, renewable - the sun and the wind provide .... energy., dam - a wall built across the river to stop its flow, petrol - a type of fuel used in cars, generator - a machine that produces electrical power, wind - moving air that is a source of clean energy, coal - black substance from the earth that can be burned, dioxide - we breathe out carbon ...,

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