tectonic plate separations mass species extinctions orbital path changes magnetic pole reversals
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Some localized layers of rock contain the element iridium. Iridium is most often found in space objects such as meteoroids and asteroids. The discovery of these iridium-containing layers has been matched to which phenomena in Earth's history?
Possibilities:
- tectonic plate separations
- mass species extinctions
- orbital path changes
- magnetic pole reversals

mass species extinctions