And there are drastically more red rocks than green ones available. Iron makes up something like 5% of the earth’s crust. Copper is around 0.006%. On parts of

And there are drastically more red rocks than green ones available. Iron makes up something like 5% of the earth’s crust. Copper is around 0.006%. On parts of the earth you could just pick up chunks of iron from bogs. It was literally just lying around.