Why is iridium considered significant in the context of the dinosaur extinction?

Question

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It indicates volcanic activity
It indicates rising sea levels
It suggests extraterrestrial influence
It is abundant on Earth's surface

Answer 1

Iridium is considered significant in the context of the dinosaur extinction because it suggests extraterrestrial influence. The unusually high levels of iridium found in the geologic layer corresponding to the mass extinction event, approximately 66 million years ago, led scientists to hypothesize that a large asteroid or comet impact contributed to the extinction of the dinosaurs. Iridium is rare on Earth's surface but more common in asteroids, which supports the idea of an extraterrestrial object colliding with Earth at that time.

Answer 2

Pick one above

Answer 3

The correct answer is: It suggests extraterrestrial influence.