GEOLOGY

Detailed explanation-1: -Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period ), after living on Earth for about 165 million years.

Detailed explanation-2: -Duckbilled dinosaurs, known as hadrosaurs, were large, two-legged, plant-eating dinosaurs. All hadrosaurs died out around 65 million years ago.

Detailed explanation-3: -Cretaceous-tertiary Extinction: 65 Million Years Ago Scientists refer to the major extinction that wiped out nonavian dinosaurs as the K-T extinction, because it happened at the end of the Cretaceous period and the beginning of the Tertiary period.

Detailed explanation-4: -Evidence suggests an asteroid impact was the main culprit. Volcanic eruptions that caused large-scale climate change may also have been involved, together with more gradual changes to Earth’s climate that happened over millions of years.

Detailed explanation-5: -When did dinosaurs live? Dinosaurs lived during most of the Mesozoic era, a geological age that lasted from 252 million to 66 million years ago. The Mesozoic era includes the Triassic, Jurassic and Cretaceous periods.