Assessing the Effects of the Asteroid on Dinosaurs.
He then moves on stating three theories about how the dinosaurs became extinct—Sex, drugs, and disasters. Gould also makes it clear that the extinction of dinosaurs is not a separate problem all together, a lot of species also became extinct.The doctor has a point, it just so happened that dinosaurs are popular species thanks mostly to Hollywood.
Types of dinosaurs. Dinosaurs are united by at least 21 traits in their skulls and skeletons. These common characters (called 'synapomorphies') are the reason palaeontologists are sure dinosaurs had a common origin. However, when definite dinosaur fossils appear (early in the Upper Triassic), the group had already split into two great orders, the Saurischia, and the Ornithischia.
Probably the most famous is the extinction that finally saw the end of the dinosaurs reign on the Earth, 65 million years ago. It wasn't just the dinosaurs that died out in this extinction.. The Dinosaur Heresies: New Theories Unlocking the Mystery of the Dinosaurs and Their Extinction by Robert T.
Sex, Drugs, Disasters, and the Extinction of Dinosaurs By Stephen Jay Gould Stephen Jay Gould (1941-2002) was Professor of Geology at Harvard University and the author of many popular essays on science, often collected into books such as The Panda’s Thumb, Hen’s Teeth and Horse’s.
With extinction of algae, being at the start of the food chain, was no doubt substantial factor in the extinction on many of the sea bearing animals and dinosaurs. Hydrology is the study of Earth s fresh water including streams, lakes, glacial ice and groundwater.
Students have a lot of interest in how the dinosaurs went extinct which provides a great setting to show students how scientists use fossil evidence to develop and support their theories. I begin this lesson by asking to list everything they know (or think they know) about the extinction of dinosaurs and how they know that information.
In 1980 Luis Alvarez and John Sepkowski Jr., famous geologists, blamed the extinction of the dinosaurs on a large celestial body which hit the Earth 65 million years ago. According to them, an asteroid five miles across blasted through the Earth’s crust, and threw up molten rock, ash, and dust.