1) True or false: All substances are made of atoms. a) True b) False 2) What is Limestone mainly made up of? a) acid b) calcium carbonate c) cement d) glass 3) What rock is heated in a rotary kiln? a) marble b) limestone c) cement d) concrete 4) Where do we find metals in nature? a) as ores in the ground b) on the beach c) in your garden d) in the toilet 5) if all the carbon and other impurities are removed from pig iron, what do we get? a) carbon steel b) pure iron c) steel d) gold

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