What am I made of?'. Pupils make a comparison between the chemistry of the human body and the Earth. First they are asked to assemble a jigsaw puzzle of the elements in the human body. These are in approximately the same proportions as the elements' percentages in the body. Did you know you have the equivalent of nearly a leg-full of hydrogen and the equivalent of a nose full of sulfur? Pupils often don't realise that that are made of the same chemical elements as the rest of the Earth.
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