Re: Are you sure?
The materials in our planet and bodies are made from a lot of non-primordial elements or "metals" as astronomers use the term. If only elements heavier than iron got expelled into interstellar space, we wouldn't be here. There's a great deal of iron and nickel (hence our planet's core), but there's also plenty of the other elements you mentioned.
Figuring out all the ways in which this happens is still being researched, I think. For example, apart from supernovas of large stars, there are also collisions.
Biting the hand that feeds IT
