steel
Yes, in the tracks and the wheels the roller coaster cart rests on.
Steel is stronger
because steel was stronger than iron
Steel, is an alloy of different metals. Mostly iron, though.
Stainless steel is stronger and retards rust unlike iron
By strength, if you mean durability, then i'd think it was steel iron corrodes pretty easily
Steel is stronger and more flexible than iron.
Steel is refined iron. It's usually stronger (=better) than steel for most uses.
it is lighter and stronger
steel
Roller coasters are made of either steel or wood, somtimes both.
Yes