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The word dinosaur means "terrible lizard." Just what is a dinosaur? Dinosaurs were land dwelling reptiles that covered the earth for millions of years during the Mesozoic era. They came in all sizes and shapes and their fossils can be found all over the world. The first dinosaurs were around 250 millions years ago during the Triassic time period. More and more dinosaurs evolved and flourished until about 65 millions years ago during the Cretaceous period when they all died out. |
There are different theories as to why the dinosaurs became extinct. Probably the most popular theory right now is the asteroid theory. According to this theory a large asteroid or comet collided with Earth about 65 million years ago. The dramatic changes in climate that resulted from this huge collision were too much for the dinosaurs. They were not able to survive. For more about extinction theories visit our Extinction Theories page. |
Dinosaur Pages - Learn about these dinosaurs by clicking on their pictures | ||||
Tyrannosaurus Rex | Brontosaurus | Stegosaurus | Triceratops | Pterodactyls |
Buy A Real Dinosaur Bone Fossil | |||
Actual pieces of 70 million year old fossilized dinosaur bone that show bone structure and bone marrow. Collected in Central Utah. Pieces are about 2 size. | |||
Item#: DB2 | Price: $5.95 |
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See other Life Studies products on our Earth Science page. Find out how fossils are formed - visit our How are fossils formed? page. |
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