I was just reading that there is more iridium in asteroids in general than in the earth’s crust. because of this when we find s large amount as we do in the K-Pg boundary we know it has been formed from a meteor strike. The most famous being 66 million years ago. But here is the question, why is iridium more prevalent in meteors? For that we must look at where most meteors come from in our solar system and suppose they were formed from planetoids that had more iridium in them than our planet. Of course we may not have found as much iridium on earth because it formed when meteors did and the heavy metal has sunk below the crust. It did this because it followed the iron with which iridium finds it easy to bond.
I guess we can dig to find out.
#iridium