2 titels gevonden in vanaf € 11,00
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In Metals, we discover how the different metals are extracted from the ground by mining or quarrying. We see how furnaces heat up the metal ores until they are molten. Then we discover how...
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In Glass, we discover how glass is made from a mixture of sand and limestone. We find out how these
chemicals are heated to a high temperature until they are molten. Then they are shaped,...
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