Iron and lead are both metals that have been used for centuries in a variety of applications. Iron is a strong, durable METAL that is used to make tools, weapons, and structures, while lead is a soft, malleable METAL that is often used in plumbing and electrical wiring. Both metals are also used in the production of batteries and ammunition. Iron is also an essential mineral for human health, while lead is a toxic METAL that can cause serious health problems if ingested.