9781422279502

47

Silver

WORDS TO UNDERSTAND alchemist a person who practiced a science that was used in the Middle Ages that had the goal of transforming ordinary metals into gold alloy a metal formed by combining two or more elements archaeologist a scientist who studies human history through the artifacts left by ancient people lode a supply of ore that is embedded between layers of rock ore a type of rock from which a metal or mineral can be extracted slag heap a hill made from the waste material from a mine