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What is the likely connection between the metal iridium and the demise of the Earth's dinosaur ...

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What is the likely connection between the metal iridium and the demise of the Earth's dinosaur ...

What is the likely connection between the metal iridium and the demise of the Earth's dinosaur population?
A)   Iridium, which is found in abundance on Earth's surface, is poisonous to reptiles.
B)   Iridium is found beneath the Earth's crust. Meteor impacts during the dinosaur age probably exposed and uncovered enough of it to poison the dinosaurs.
C)   Iridium is found in meteorites but is rare on the Earth. The existence of a world-wide layer of it suggests a large meteor impact during the dinosaur age. This probably raised enough dust to block out sunlight and kill the dinosaurs.
D)   Iridium is highly radioactive. Its presence in a geologic layer dating to the dinosaur age suggests that natural radioactivity reached dangerous levels at that time, and the dinosaurs died from overexposure.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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doit_the_clown Author

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7 years ago

You make an excellent tutor!

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Good timing, thanks!

novae

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Thank you, thank you, thank you!

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