Rock Layers Right at the K-Pg Boundary Have Enriched Concentrations

question 13

Multiple Choice

Rock layers right at the K-Pg boundary have enriched concentrations of the element iridium.This is significant for understanding the mass extinction that happened at the time,because ________.

• A) iridium is toxic to life and could have killed off many species
• B) iridium is very rare in the Earth's crust but relatively common in meteorites
• C) iridium forms under conditions of extreme shock and heat
• D) iridium would have caused an episode of severe acid rain
• E) iridium-rich dust is particularly effective at blocking incoming solar radiation

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