Carbon dioxide - A gas in the air that comes from breathing and burning fossil fuels., Chemical reaction - When substances change into different ones by mixing together., Nuclear fuels - Materials used in reactors that produce energy through nuclear reactions., Plutonium - A radioactive metal made in nuclear reactors, used in weapons and reactors., Radioactive - Emitting harmful energy due to unstable atoms., Uranium - A metal used for making nuclear fuel and weapons, found in rocks and soil.,

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