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Transcript of Dinosaurs
Dinosaurs lived in three main times during the Mesozoic Era, which consisted of the Triassic period which was about 203 to 208 million years ago. Jurassic Period which was about 208 to 145 million years ago. Cretaceous Period which was about 145 to 65 million years ago. What Are Dinosaurs? What were the kinds of Dinosaurs that lived back then? What did they eat? What Are The Theories of Their Extinction? There are many theories of how our Dinosaur friends became extinct.
One main theory that scientists think they became extinct is because a large massive asteroid crashed into the earths surface and made a big explosion wiping out every Dinosaur on Earth.
Another is that a deadly ice storm came and froze everything up and the Dinosaurs died by freezing to death. http://www.wvup.edu/ecrisp/lecture2mesozoic.html By Max Segura Dinosaurs We all know that Dinosaurs are either Herbivores, Carnivores, or Omnivores.
Some Dinosaurs also eat eggs, like the Oviraptoridae, which are also known as "Egg Snatchers". It ran on its hind legs. The greatest feature of this Dinosaur was its jaw. It's jaw was "well-muscled" and a great way to crush things. http://www.sciencekids.co.nz/sciencefacts/dinosaurs/types.html Other Theories... Saurischia (lizard hipped dinosaurs) Therapods- "Therapod" means "beast foot" and in this group we have all of the meat eating Dinosaurs. They had two legs and looked scary, some that you all might know as the Tyrannosaurus rex and Velociraptor. Sauropods- They can walk on four legs, and they grow into giant sizes, they are also herbivores, some include the Brachiosaurus. Ornithiscia (bird hipped dinosaurs) Thyreophora - This name means "Shield bearers", basically this group is of Dinosaurs that have armor on their backs. Some include the Stegosaurus Cerapods- This group includes various groups of Dinosaurs that have horns on their heads. Like the Triceratops and the Ornithopods which are Bird footed Dinosaurs. http://www.dinosaur-world.com/feathered_dinosaurs/oviraptoridae.htm Other theories say that a large volcano just erupted and hot lava came out and slowly burned everything in its path... No one really knows what happened... for all we know they might have just grown wings and flown away... There are many theories. Like mental diseases, a Supernova exploding, poisoning by Uranium, poisoning caused by Fungi reproduction, the lack of reproduction, or even blindness... http://www.dinosaurfact.net/dinoextinct.php