carbon dioxide - (noun) a gas that is produced when people and animals breathe out, or when carbon is burned, chemical reaction - (noun) a process in which the structure of atoms or molecules that make up a substance are changed, nuclear fuel - (noun) a substance that is used in a nuclear power station to create heat, plutonium - (noun) a metallic chemical element that is radioactive and used in the production of nuclear power, radioactive - (adjective) having or producing the energy that comes from the breaking up of atoms, uranium - (noun) a heavy, grey metal that is used in the production of nuclear power,

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