Supporting the claim that a meteorite caused the mass extinction at the end of the Cretaceous period,abnormally high concentrations of _______ have been found in rocks dating from that time.

Question

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Abnormally high concentrations of iridium have been found in rocks dating from the end of the Cretaceous period, supporting the theory that a meteorite impact caused the mass extinction event. Iridium is rare in Earth's crust but commonly found in meteorites, providing evidence for an extraterrestrial impact.

Supporting the Claim That a Meteorite Caused the Mass Extinction