[codesnik]

And earth contains so much of heavier elements.

[analog31]

As I learned it long ago in school, elements up to the mass of iron are formed by stellar fusion. That's the point where fusion is no longer exothermic. Any element on earth that is heavier than iron is the product of a supernova. So we live on a ball of supernova debris.

[kadoban]

Most of what we live on, the vast majority, is iron or lighter. So it's more that we're sprinkled with supernova debris. But we are made out of stardust, so that's something.

[euroderf]

> elements up to the mass of iron are formed by stellar fusion

And elements down to the mass of iron can also be formed. But iron is at the bottom of the well.