In this episode, Jesse and Chris follow up on the K-T Extinction episode from last week.  Why is Iridium so important in this story?  Our show notes summary is below.

Why is Iridium identified in these layers? 

• Well, it’s higher in meteorites - but not really high. 
• Why is it higher in meteorites though? 
  • It’s not actually high in meteorites, it’s low in the Earth’s crust!  Very very very low. 
• Yet, Earth is made of meteorites, so where did the Ir go?
  • Most of it is in the core and we talk about why.
• Very rare on the surface of the Earth - only three metric tons mined and used yearly
  • The most corrosion resistant substance known - even at high temperatures
  • If it's so corrosion resistant, what is it used for?

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Website: https://planetgeocast.com/