To make steel, you need iron ore, coal, and limestone, which all come from the earth.' CURIOUS CAT:Are you curious to find out what happens next? BOY:Yes. GIRL:Yeah, that'd be great. CURIOUS CAT ...

It wasn't until the discovery that iron ore has an affinity for (and ... This resulted in a purer, stronger metal: steel. One process of making steel was to heat wrought iron -- which had a ...