Why are birds the only surviving dinosaurs? | Natural History Museum

The Rise and Fall of Dinosaurs, As Explained by Extinction Events

Why did the dinosaurs go extinct?

Geologists have found that the boundary between the Cretaceous and Paleogene layers called the “K–Pg” boundary (previously known as the "K-T boundary"), in many regions is marked by high levels of the rare metal iridium. While it is true that nearly all dinosaur fossils are absent above this K-Pg boundary, the areas with high iridium levels are not restricted to the thin zone that defines this boundary. In fact, in the same regions where the K-PG boundary was discovered, recent studies have iden

Mass extinction facts and information from National Geographic

Earth's History | What Happens After a Meteorite Impact? | Britannica