Dinosaurs became extinct from "summary" of A Short History of Nearly Everything: Special Illustrated Edition by Bill Bryson
Around 65 million years ago, the Earth experienced a cataclysmic event that brought about the end of the dinosaurs. This event, known as the Cretaceous-Paleogene extinction event, was a mass extinction that wiped out nearly three-quarters of all plant and animal species on Earth. The most famous victims of this extinction were, of course, the dinosaurs. The leading theory for the cause of this mass extinction is a massive asteroid impact. Scientists believe that a 6-mile-wide asteroid collided with the Earth, creating a crater over 100 miles wide. The impact would have released an immense amount of energy, causing widespread fires, earthquakes, and tsunamis. The dust and debris thrown up into the atmosphere would have blocked out the sun, leading to a rapid and dramatic cooling of the Earth's climate. This sudden and drastic change in climate would have had devastating effects on the dinosaurs and their ecosystems. With food sources ...
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