2.5 billion tons of iron ore are processed annually.Iron is the fourth most common element by mass in the crust of the Earth.
However, it composes 90% of all the metal that humans refine. It’s commonly found in alloys of metal, much like in your car.Iron rust is also why your blood is red.
Rust is generally an orange color when we see in on the metal, though. There are three distinct stages of rust you’ll see on your car.Surface rust just sits on the surface and appears in bumps or nicks in paint and on frames.
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