Iridium is considered significant in the context of dinosaur extinction primarily because it suggests extraterrestrial influence. The presence of a layer rich in iridium, found in the geological record, particularly at the Cretaceous-Paleogene boundary, is often associated with the hypothesis that a large asteroid or comet impact contributed to the mass extinction event that led to the demise of the dinosaurs around 66 million years ago. Iridium is rare on the Earth's surface but more common in asteroids, which supports the idea of an impact event.
Why is iridium considered significant in the context of dinosaur extinction?
It suggests extraterrestrial influence
It indicates volcanic activity
It indicates rising sea levels
It is abundant in earths surface
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