Long, long ago, before people ever stepped foot on this planet we call earth, huge reptiles known as dinosaurs walked around freely. Then, all of a sudden, they were gone. Some scientists think it was an asteroid, while others think it was a change in climate. Whatever it was, it caused all the dinosaurs to die out.
All we have left now are their bones and the impressions their bodies left in the land. Those clues can tell us a lot about how dinosaurs used to live, though. How much have you learned from fossils and bones? Take this quiz and test your knowledge.