dinosaur - Kids | Britannica Kids | Homework Help
Dinosaurs were common during the Triassic, Jurassic, and Cretaceous geologic time periods. Those time periods lasted from 252 to 66 million years ago. Not all species, or types, of …
dinosaurs at a glance - Kids | Britannica Kids | Homework Help
Dinosaurs were lizardlike reptiles that lived on Earth for more than 150 million years. The word dinosaur means “terrible lizard.” Remains or traces of dinosaurs were first discovered in the …
dinosaur - Students | Britannica Kids | Homework Help
Dinosaurs were lizardlike reptiles that roamed Earth for nearly 180 million years. They first appeared roughly 245 million years ago, and most died out by about 66 million years ago. …
dinosaurs at a glance - Students | Britannica Kids | Homework Help
From studying dinosaur remains, scientists have concluded that dinosaurs were the ancient relatives of today’s crocodiles, snakes, lizards, and birds. Indeed, although most dinosaurs …
Allosaurus - Kids | Britannica Kids | Homework Help
Allosaurus was a fierce dinosaur that roamed Earth before the similar but more well-known Tyrannosaurus rex appeared. The name Allosaurus means “other lizard.” Allosaurus is a …
fossil - Kids | Britannica Kids | Homework Help
For example, scientists have found dinosaur footprints in rock that formed from mud. Another kind of fossil can form after a small insect or a piece of a plant gets trapped in resin. (Resin is a …
Allosaurus - Students | Britannica Kids | Homework Help
A large carnivorous, or meat-eating, dinosaur, Allosaurus was a fierce predator that inhabited North America and probably Africa, Australia, and Asia during the late Jurassic… Articles
Cretaceous Period - Students | Britannica Kids | Homework Help
The Cretaceous Period ended with one of the greatest mass extinctions in the history of Earth. It exterminated the dinosaurs, marine and flying reptiles, and many marine invertebrates. The …
paleontology - Kids | Britannica Kids | Homework Help
Fossils help scientists to build models of dinosaurs, early humans, and other early animals. Paleontology can also tell scientists about how Earth itself has changed—for example, how …
plesiosaur - Kids | Britannica Kids | Homework Help
Plesiosaurs were reptiles that lived in the ocean. They lived during the time of the dinosaurs. However, plesiosaurs were not dinosaurs. They did not have the hips and legs…